Chemistry 12

+2 Chemistry

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Class 12 FULL Chemistry

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Which of the following ores is concentrated by chemical leaching method?

1. Galena

2. Cinnabar

3. Argentite

4. Copper pyrites

Which of the following is a condensation polymer?

1. Teflon

2. PVC

3. Polyester

4. Neoprene

Volume of one mole of any gas at NTP is

1. 10.2 litre

2. 11.2 litre

3. 22.04 litre

4. 22.8 litre

Which of the following molecules has highest dipole moment?

1. CH₂Cl₂

2. CCl₄

3. CHCl₅

4. CH₃Cl

Which of the following amides will give ethylamine on reaction with sodium hypobromide ?

1. Propanamide

2. Butanamide

3. Acetamide

4. Benzamide

An unknown alcohol is treated with “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism?

1. Tertiary alcohol by S_N¹

2. Tertiary alcohol by S_N²

3. Secondary alcohol by S_N²

4. Secondary alcohol by S_N¹

During acetylation of glucose it needs ,v moles of.acetic anhydride. The value of x would be

1. 3

2. 4

3. 5

4. 1

Which of the following reactions follows Markovnikov’s rule?

1. C₃H₆ + HBr

2. C₂H₄ + HBr

3. C₃H₆ + Br₂

4. C₃H₆ + Cl₆

Terylene is a condensation polymer of ethylene glycol and

1. dimethyl terephthalate

2. salicylic acid

3. phthalic acid

4. benzoic acid

The reaction between phenol and chloroform in the presence of aqueous NaOH is

1. nucleophilic addition reaction

2. electrophilic addition reaction

3. electrophilic substitution reaction

4. nucleophilic substitution reaction

The number of possible isomers for the complex |Co(C₂O₄)₂ (NH₃)₂|

1. 3

2. 1

3. 2

4. 4

If the specific resistance of a solution of concentration C g equivalent litre-1 is R, then its equivalent conductance is :

1. 1000/RC

2. 100R/C

3. RC/1000

4. C/1000R

What happens when tertiary butyl alcohol is passed over heated copper at 300°C?

1. Secondary butyl alcohol is formed

2. 1-butene is formed

3. Butanol is formed

4. 2-methylpropene is formed

In which of the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other?

1. Cr²⁺, Cr³⁺

2. Ti⁺, Ti³⁺

3. Cu⁺, Cu³⁺

4. V²⁺, VO²⁺ (V⁴)

Glycosidic linkage is an

1. ester linkage

2. acetyl linkage

3. ether linkage

4. amide linkage

The oxidation state of nickel in |(Ni(CO₄)| is

1. 4

2. 3

3. 1

4. 2

In pseudo unimolecular reactions

1. both the reactants are present in low concentration

2. both the reactants are present in same concentration

3. one of the reactant is present in excess

4. one of the reactant is non-reactive

Resistance of 0.1 M KCl solution in a conductance cell is 300 ohm and conductivity is 0.013 Scm-1. The value of cell constant is :

1. None of these

2. 3.9 cm-1

3. 39 m-1

4. 3.9 m-1

Starch is composed of two polysaccharides which arc

1. amylose and glycogen

2. cellulose and glycogen

3. amylopectin and glycogen

4. amylose (20%) and amylopectin (80%)

Natural rubber is a polymer of

1. 1, 1-dimethylbufadiene

2. 2-methyl-1, 3-rbutadiene

3. 2-chlorobuta-1, 3-diene

4. 2-chlorobut-2-ene

Which of the following polymers does not involve cross-linkages?

1. Vulcanised rubber

2. Bakelite

3. Teflon

4. Melamine

Amine that cannot be prepared by Gabricl-Phthalmidie synthesis is

1. benzyl amine

2. aniline

3. iso-butylamine

4. methyl amine

How many number of atoms are there in a cube based unit cell having one atom on each corner and two atoms
on each body diagonal of cube ?

1. 4

2. 8

3. 9

4. 6

Arrange the following compounds in increasing order of basicity:
CH₃NH₂, (CH₃)₂ NH, NH₃, C₆H₅NH₂

1. (CH₃)₂NH < CH₃NH₂ <NH₃ < C₆H₅NH₂

2. C₆H₅NH₂ <NH₃ < CH₃NH₂<(CH₃)₂NH

3. CH₃NH₂ < (CH₃)₂NH < NH₃ < C₆H₅NH₂

4. C₆H₅NH₂ < NH₃ < (CH₃)₂NH < CH₃NH₂

For which of the following ores froth floatation method is used for concentration?

1. Camallite

2. Haematite

3. Magnetite

4. Zinc blende

The end product Z of the reaction

1. propylamine

2. diethylamine

3. triethylamine

4. propanenitrile

Phenol when treated with excess of bromine water gives a white precipitate of

1. o-bromophenol

2. bromobenzene

3. p-bromophenol

4. 2, 4, 6-tribromophenol

Identify the correct pathway to convert propanoic acid to ethylamine. The reagent represented by A, B and C are
MCQ Questions for Class 12 Chemistry Chapter 13 Amines with Answers 2

1. (a)

2. (c)

3. (d)

4. (b)

In which of the following allotropes of carbon, percentage of carbon is maximum?

1. None of these

2. Coconut charcoal

3. Wood charcoal

4. Graphite

Which of the following is not correct for enzyme catalysis?

1. The enzyme activity is maximum at optimum pH which is between 5-7

2. The favourable temperature range of enzyme activity is between 25-37°C

3. Each enzyme is specific for a given reaction

4. The enzymatic activity is increased in presence of certain substances called co-enzymes

Ore of aluminium is

1. hematite

2. None of these

3. dolomite

4. bauxite

The melting point of copper is higher than that of zinc because

1. the atomic volume of copper is higher

2. the s as well as d electrons of copper are involved in metallic bonding

3. the electrons of copper are involved in metallic bonding

4. copper has a bcc structure

Which of the following metals is not extracted by leaching?

1. Aluminium

2. Gold

3. Mercury

4. Silver

Aldehydes other than formaldehyde react with Grignard’s reagent to give addition products which on hydrolysis give

1. secondary alcohols

2. carboxylic acids

3. tertiary alcohols

4. primary alcohols

Which one of the following is diamagnetic ion?

1. Co²⁺

2. Cu²⁺

3. Ni²⁺

4. Zn²⁺

An alcohol X when treated with hot cone. H₂SO₄ gave an alkene Y with formula C₄H₈. This alkene on ozonolysis gives single product with molecular formula C₂H₄O. The alcohol is

1. butan-2-ol

2. butan-1-ol

3. 2,2-dimethylbutynal-1-oI

4. 2-methylpropan-1-ol

Reduction of CH₃CH₂NC with hydrogen in presence of Ni or Pt as catalyst gives

1. (CH₃)₃N

2. CH₃CH₂NHCH₃

3. CH₃CH₂NH₂

4. CH₃CH₂NHCH₂CH₃

Which of the following will not show geometrical isomerism?

1. [Pt(NH₃)₂Cl₂]

2. [Co(en)₂Cl₂]Cl

3. [Cr(NH₃)₄Cl₂]Cl

4. [(Co(NH₃)₅NO₂]Cl₂

If the radius of an atom of an element is 75 pm and the lattice is body centred cubic, the edge of the unit cell will
be :

1. 173.2 pm

2. 212.1 pm

3. 32.475 pm

4. 37.5 pm

The product of hydrolysis of ozonide of 1-butene are

1. propanal and methanal

2. ethanol only

3. ethanal and methanal

4. methanal only

Which of the following will form an ideal solution ?

1. C₂H₅OH and water

2. C₆H₆ and C₆H₅CH₃

3. HNO₃ and water

4. CHCl₃ and CH₃COCH₃

in the above reaction is

1. CH₃CH₂CH₂CONHCOCH₃

2. CH₃CH₂CH₂NHCOCH₃

3. CH₃CH₂CH₂CONHCH₃

4. CH₃CH₂CH₂NH₂

Terfenadine is commonly used as

1. antihistamine

2. antibiotic

3. antifertility drug

4. antimicrobial

The chemical reaction, 2O₃ → 3O₂ proceeds as O₃ ⇌ O₂ + |O| (fast) |O| + O₃ → 2O₂ (slow) The rate law expression will be

1. Rate = k [O₂] [O]

2. Rate = k [O₃]²

3. Rate = k [O₃]² [O₂]^-1

4. Rate = k [O] [O₃]

In a reaction, 2X → Y, the concentration of X decreases from 0.50 M to 0.38 M in 10 min. What is the rate of reaction in Ms^-1 during this interval ?

1. 4 × 10^-2

2. 2 × 10^-4

3. 2 × 10^-2

4. 1 × 10^-2

Which among the following is most reactive to give nucleophilic addition?

1. ICH₂CHO

2. ClCH₂CHO

3. FCH₂CHO

4. BrCH₂CHO

The hybridisation of carbon in diamond is

1. dsp²

2. sp³

3. sp²

4. sp

Aldehydes that do not undergo aldol condensation are
1. propanal
2. trichloroethanal
3. 2-phenylethanal
4. fethanal
5. benzaldehyde

1. 2, 3 and 5 only

2. 3 and 4 only

3. 1, 2 and 3 only

4. 2 and 5 only

The decomposition of dimethyl ether is a fractional order reaction. The rate is given by rate =k(PCH₃OCH₃)^3/2. If the pressure is measured in bar and time in minutes, then what are the units of rate and rate constant?

1. bar min^-1, bar^1/2 min^-1

2. bar^1/2 min^-1, bar² min^-1

3. bar min^-1, bar² min^-1

4. bar min^-1, bar^1/2 min^-1

The number of molecules of the reactants taking part in a single step of the reaction is indicative of

1. fast step of the mechanism of a reaction

2. half-life of the reaction

3. moleclarity of a reaction

4. order of a reaction

Acid catalysed dehydration of t-butanol is faster than that of n-butanol because

1. t-butanol has a higher boiling point

2. primary carbocation is more stable than tertiary carbocation

3. tertiary carbocation is more stable than primary carbocation

4. rearrangement takes place during dehydration of t- butanol

Which of the following treatment will convert starch directly into glucose?

1. Fermentation by diastase

2. Heating with dilute NaOH

3. Heating with dilute H₂SO₄

4. Fermentation by zymase

This reaction is an example of
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 1

1. nucleophilic addition

2. electrophilic addition

3. free radical addition

4. electrophilic substitution

The drugs which are given to the patients suffering from anxiety and mental tension are known as

1. analgesics

2. antibiotics

3. tranquilizers

4. antimicrobials

Which of the following sulphides when heated strongly in air gives the corresponding metal without undergoing separate reduction of oxide?

1. Cu₂S

2. FeS

3. ZnS

4. HgS

The general formula of carbohydrates is

1. C_nH_2n+1O

2. C_x(H₂O)

3. C_n(H₂,O)_2n

4. C_nH_2nO

Which of the following amines will give carbylatnine reaction?

1. C₃H₇NHC₂H₃5

2. (C₂H₅)₃N

3. C₂H₅NH₂

4. (C₂H₅)₂NH

What is the test to differentiate between penta-2-one and pentan-3-one?

1. Aldol condensation test

2. Benedict’s test

3. Fehling’s test

4. Iodoform test

The correct IUPAC name of the following compound is |Cr(NH₃)₅(NCS)||ZnCl₄|

1. Penta amine isothicoyanato chromate (II)

2. Penta amine isothiocyanato chromium (III) tetrachlorozincate (II)

3. isothiocyanatopenta amine chromium (II) zinc chloride (IV)

4. Penta amine isothicocyanatezinc chloridechromate (III)

If the radius of metal atom is 1.00 Å and its crystal structure is simple cubic, then what is the volume of one unit
cell ?

1. 4 × 10-30 cm3

2. 8 × 10-28 m3

3. 2 × 10-24 cm3

4. 8 × 10-30 m3

What are the hydrolysis products of sucrose?

1. Glucose + Glucose

2. Fructose + Fructose

3. Glucose + Galactose

4. D-Glucose + D-Fructose

The major product of acid catalysed dehydration of 2-methylcyclohexanol and butan-1-ol are respectively

1. 2-methylcyclohexene and but-2-ene

2. 1 -methylcyclohexene and but-1-ene

3. 1-methylcyclohexene and but-2-ene

4. 2-methylcyclohexene and butane

The correct IUPAC name of the coordination compound K₃|Fe(CN)₅NO| is

1. Potassium pentacyanonitrosylferrate (II)

2. Potassium nitritepentacynanoiron (II)

3. Potassium pentacyanonitroferrate (II)

4. Potassium nitritopentacyanoferrate (IV)

The reaction of toluene with chlorine in presence of FeCl3 gives predominantly.

1. benzyl chloride

2. benzoyl chloride

3. amixture of o-and p-chlorotoluene

4. m-chlorotuluene

What is the end product in the following sequence of reactions?
MCQ Questions for Class 12 Chemistry Chapter 13 Amines with Answers 4

1. Aniline

2. Benzenediazxonium chloride

3. Phenol

4. Benzene

The final product (Y) in the following sequence of chemical reaction is

1. sodium salt of carboxylic acid

2. a carboxylic acid

3. An alkene

4. an aldehyde

The compound having general formula C_nH_2n+2 is

1. Alkene

2. none of these

3. Alkyne

4. Alkane

Study the given reaction and identify the process which is carried out
MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers 3

1. It is used to prepare cyclic aldehydes and ketones

2. It is used to distinguish aldehydes from ketones

3. It is used to study polar nature of aldehydes and ketones

4. It is used for purification of aldehydes and ketones

Arrange the following alcohols in order of increasing reactivity towards sodium metal.
(i) (CH₃)₃C-OH
(ii) (CH₃)₂CH-OH
(iii) CH₃CH₂OH

1. (iii) < (i) < (ii)

2. (ii) > (i) < (iii)

3. (iii) < (ii) < (i)

4. (i) < (ii) < (iii)

The unit of rate and rate constant are same for

1. first order reaction

2. third order reaction

3. zero order reaction

4. second order reaction

Some drugs do not bind to the enzyme’s active site, instead bind to a different site of enzyme. This site is called

1. allosteric site

2. competitive site

3. substrate site

4. ionic site

Propanone on reaction with alkyl magnesium bromide followed by hydrolysis will produce

1. tertiary alcohol

2. carboxylic acid

3. primary alcohol

4. secondary alcohol

What happens when potassium iodide reacts with acidic solution of potassium dichromate?

1. Chromium sulphate is formed

2. It liberates iodine

3. Potassium sulphate is formed

4. All the above products are formed

The rate constant of a reaction depends upon

1. extent of the reaction

2. temperature of the reaction

3. initial concentration of the reactants

4. the time of completion of reaction

The negative part of the addendum (the molecule to be added) adds on the carbon atom of the double bond containing the least number of hydrogen atoms. This rule is known as

1. Markovnikov’s rule

2. van’t hoff rule

3. Peroxide rule

4. Saytzeffs rule

Rate constant in case of first order reaction is

1. directly proportional to concentration units

2. inversely proportional to the concentration units

3. inversely proportional to the square of concentration units

4. independent of concentration units

General formula of Alkene is

1. C_nH_2n

2. none of these

3. C_nH_2n-2

4. C_nH_2n+2

The S in buna-S refers to

1. Salicylate

2. Styrene

3. Sodium

4. Sulphur

Which of the following can adsorb larger volume of hydrogen gas?

1. Finely divided platinum

2. Colloidal solution of palladium

3. A single metal surface of platinum

4. Small pieces of palladium

What is the basic formulae for starch?

1. (C₆H₁₂O₆)_n

2. (C₆H₁₀O₅)_n

3. C₁₂O₁₂O₁₁

4. (C₆H₁₂O₄)_n

In the reaction A + B→ Products, the doubling of [A], increases the reaction rate to four times, but doubling of [B] has no effect on the reaction rate. The rate expression is….

1. Rate = K[A]

2. Rate = K[A]2[B]2

3. Rate = K[A][B]

4. Rate = K[A]2

The overall rate of a reaction is governed by

1. the sum total of the rates of all intermediate steps

2. the average of the rates of all the intermediate steps

3. the rate of slowest intermediate step

4. the rate of fastest intermediate step

Which of the following form ideal solution?

1. C₆H₆ – C₆H₅CH₃

2. Water + alcohol

3. Ethanol + Cyclohexane

4. C₂H₅OH – C₆H₁₂

Half life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min?

1. 75%

2. 25%

3. 50%

4. 99.9%

The chemical substances used to bring down body temperature in high fever are known as

1. analgesics

2. antihistamines

3. antipyretics

4. tranquilizers

_____does not affect the rate of reaction.

1. ∆H of reaction

2. size of the vessel

3. physical state of reactants

4. amount of the reactants

For the square planar complex |M_abcd| where M is the central atom and a, b. c, d are monodentate ligands, the number of possible geometrical isomers are

1. 2

2. 3

3. 1

4. 4

The oil used as frothing agent in froth floatation process is

1. coconut oil

2. palmitic oil

3. pine oil

4. castor oil

8 g NaOH is dissolved in one litre of solution, its molarity is :

1. 0.2 M

2. 0.1 M

3. 0.4 M

4. 0.8 M

Which of the following ores cannot be concentrated by magnetic separation?

1. Haematite

2. Siderite

3. Magnetite

4. Malachite

Which of the following compounds will have highest melting point?

1. m-Dichlorobenzene

2. o-Dichlorobenzene

3. p-Dichlorobenzene

4. Chlorobenzene

The rate of reaction of spontaneous reaction is generally very slow. This is due to the fact that:

1. The equilibrium constant of the reaction is < 1

2. The reaction are exothermic

3. The activation energy of the reaction is large

4. The reaction are endothermic

Diamond belongs to the crystal system :

1. hexagonal

2. tetragonal

3. triclinic

4. cubic

Fe³⁺ ion is more stable than Fe²⁺ ion because

1. Fe²⁺ has a larger size than Fe³⁺

2. Fe³⁺ ions are coloured hence more stable

3. configuration of Fe²⁺ is 3d⁵ while Fe³⁺ is 3d⁵

4. more the charge on the atom, more is its stability

Which of the following can be used as an analgesic without causing addiction?

1. Morphine

2. Codeine

3. Aspirin

4. Heroin

Which of the following metals cannot be obtained by reduction of its metal oxide by aluminium ?

1. Mn

2. Fe

3. Mg

4. Cr

Identify the correct IUPAC name

1. (CH₃)₃CNH₂ = 2-methylpropan-2-amine

2. (CH₃CH₂)₂NCH₃ = N-Ethyl-N-methylethanamine

3. (CH₃)₂CHNH₂ = 2, 2-Dimethyl-N-propanamine

4. CH₃NHCH (CH₃)₂ = N-Methylpropan-2-amine

Barbituric acid and its derivatives are well known as

1. tranquilizers

2. antiseptics

3. analgesics

4. antipyretics

For a reaction pA + qB→ Products. Rate = K[A]m [B]n. Then

1. (p + q) = (m + n) or (p + q) ≠ (m + n)

2. (p + q) ≠ (m + n)

3. (p + q) = (m + n)

4. (p + q) > (m + n)

Secondary amines can be prepared by

1. reduction of isonitriles

2. reduction of nitro compounds

3. reduction of nitriles

4. oxidation of N-substituted amides

Your score is

Class 11 FULL Chemistry

These MCQs are intended for checking your Chemistry, All Chapters knowledge!!

for more new questions refresh this page !!

Which of the following is most soluble in water?

1. SrSO₄

2. BaSO₄

3. CaSO₄

4. MgSO₄

Which of the following element was absent in the Mendeleev's periodic table :-

1. F

2. Si

3. B

4. Tc

Hydrogen combines with other elements by

1. Gaining an electron

2. Losing, gaining or sharing electron

3. Sharing an electron

4. Losing an electron

An atom which has lost one electron would be

1. Negatively charged

2. Carry double positive charge

3. Positively charged

4. Electrically neutral

Which of the following statement is false :-

1. Boron and silicon are diagonally related

2. Typical elements lies in 3rd period

3. Elements of ns2 np6 electronic configuration lies in 1st to 6th period

4. The seventh period will accommodate thirty two elements

In O₂ and H₂O₂, then O-O bond lengths are 1.21 and 1.48Å respectively. In ozone, the average O-O bond length is

1. 1.52 Å

2. 1.18 Å

3. 1.28 Å

4. 1.44 Å

Which of the following compound show resonance ?

1. Only 1

2. Only 3

3. Only 4

4. Only 2

Which of the following statement is correct for diborane ?

1. None of these

2. Small amines like NH₃, CH₃NH₂ give unsymmetrical cleavage of diborane.

3. Both

4. Large amines such as (CH₃)₃N and pyridine gives symmetrical cleavage of diborane.

The number of electrons in [19K40] - is

1. 40

2. 18

3. 20

4. 19

Resonance effect involves :

1. Delocalization of negative charge along a conjugated system.

2. Delocalization of 𝝿–electrons along a conjugated system.

3. All are correct.

4. Delocalization of lone pair along a conjugated system.

Which alkali metal has highest tendency for half reaction; M(g) → M+(aq) + 1e-?

1. Li

2. Cs

3. K

4. Na

Select the incorrect statement.

1. Mercury has relatively very low density.

2. Solid water is lighter than liquid water.

3. Stronger the intermolecular forces of attraction, higher is the melting point of the solid.

4. Intermolecular distance of separation between neighbouring molecules is shorter in solid.

Which solid will have weakest intermolecular forces ?

1. Naphthalene

2. Sodium fluoride

3. Ice

4. Phosphorus

The elements which are cited as an example to prove the validity of mendeleev's periodic law are

1. Co, Ni

2. Ga, Sc

3. H, He

4. Zr, Hf

Thermal stability of alkaline earth metal carbonates in decreasing order is

1. BaCO₃ > SrCO₃ > CaCO₃ > MgCO₃

2. CaCO₃ > SrCO₃ > MgCO₃ > BaCO₃

3. BaCO₃ > SrCO₃ > MgCO₃ > CaCO₃

4. MgCO₃ > CaCO₃ > SrCO₃ > BaCO₃

The boiling points of hydrides of group 16 are in the order :

1. H₂O > H₂S > H₂Se > H₂Te

2. H₂O > H₂Te > H₂Se > H₂S

3. H₂O > H₂Se > H₂S > H₂Te

4. H₂Te > H₂Se > H₂S > H₂O

Identify the incorrect statement about the structure of diborane.

1. All six B – H bond are regular two centre two electron bonds.

2. There are two bridging hydrogen atoms.

3. The four terminal hydrogen atoms and the two boron atoms lie in one plane.

4. The hybridisations of both the boron atoms are same and sp3

Atomic weight of an element is not necessarily
whole number because

1. it contains isotopes

2. atoms are no longer considered indivisible

3. it contains allotropic forms

4. it contains electrons, protons and neutrons

Identify the wrong statement in the following:

1. Ozone layer does not permit infrared radiation from the sun to reach the earth

2. Greenhouse effect is responsible for global warming

3. Chlorofluorocarbons are responsible for ozone layer depltion

4. Acid rain is mostly because of oxides of nitrogen and sulphur

H₂O₂ is manufactured these days

1. By the action of H₂SO₄ on Na₂O₂

2. By the action of H₂O₂ on BaO₂

3. By electrolysis of 50% H₂SO₄

4. By burning hydrogen in excess of oxygen

The equilibrium constant for the reaction N2 (g) + O2 (g) ⇌ 2NO(g) is 4 × 10-4 at 2000K . In presence of a catalyst ,
equilibrium is attained ten times faster . Therefore , The Equilibrium constant in presence of the catalyst at 2000K is

1. Difficult to compute without more data

2. 4 × 104 × 10-5

3. 4 × 104 × 10-4

4. 4 × 10-3

Lead pipes are not used for carrying drinking water because

1. They are covered with a coating of lead carbonate.

2. None of these

3. Water containing dissolved air attacks lead forming soluble hydroxide.

4. They are corroded by air and moisture.

The strength in volumes of a solution containing 30.36g litre of H₂O₂ is

1. None of these

2. 20 volume

3. 5 volume

4. 10 volume

The nitrogen atom has 7 protons and 7 electrons, the nitride ion (N3-) will have

1. 4 protons and 10 electrons

2. 7 protons and 10 electrons

3. 10 protons and 7 electrons

4. 4 protons and 7 electrons

The element with atomic number Z = 115 will be placed in :-

1. 8th period, IVA group

2. 7th period, VA group

3. 6th period, VB group

4. 7th period, IA group

An element having atomic number 25 and atomic
weight 55 will have –

1. 55 neutrons

2. 25 neutrons and 30 protons

3. 25 protons and 30 neutrons

4. 55 protons

The percentage of para hydrogen in ordinary hydrogen increases when:

1. None of these

2. Temperature is lowered

3. Temperature is increased

4. Pressure is increased and temperature is decreased

Nitrogen atom has an atomic number of 7 and oxygen has an atomic number 8. The total number of electrons in a nitrate ion (NO₃) will be

1. 64

2. 16

3. 8

4. 32

The oxidation number of N in NH4Cl is

1. + 5

2. – 3

3. + 3

4. – 5

Which of the following cannot be oxidized by H₂O₂?

1. PbS

2. KI/HCl

3. O₃

4. Na₂SO₃

Which of the following statement is correct?

1. –I group stabilises the carbanion

2. all of these

3. +I group stabilises the carbocation

4. +I group stabilises the carbon free radical

Which of the following gives CO₂ on heating?

1. Na₂CO₃

2. K₂CO₃

3. Rb₂CO₃

4. Li₂CO₃

Oxidation number of sulphur in S2O32- is

1. +2

2. 0

3. +6

4. -2

The false statement among the followings:

1. SO_x can be removed from flue gases by passing through a solution of citrate ions

2. Ammonia acts as a sink for NO_x

3. Limestone acts as a sink for SO_x

4. The average residence time of NO is one month

Solubility of alkali metal carbonates

1. Increases as we go down the group

2. Decreases as we go down the group

3. Increases first and then decreases

4. Does not show regular variation

Among the Lanthanides the one obtained by synthetic method is :–

1. Ce

2. Pm

3. Pr

4. Lu

When KMnO4 is reduced with oxalic acid in acidic solution, the oxidation number of Mn
changes from

1. 6 to 4

2. 7 to 4

3. 4 to 2

4. 7 to 2

A crystalline solid

1. Undergoes deformation of its geometry easily

2. Has no define melting point

3. Changes abruptly from solid to liquid when heated

4. Has an irregular 3-dimensional arrangements

The element exhibiting most stable
+ 2 oxidation state among the following is

1. Ag

2. Fe

3. Sn

4. Pb

When CuSO4 reacts with KI, the oxidation number of Cu
changes by

1. 2

2. -1

3. 0

4. 1

Electron density order in the benzene nucleus is

1. I > IV > II > III

2. IV > II > III > I

3. I > III > II > IV

4. I > II > III > IV

Electrolysis of 𝑋 gives 𝑌 at anode. Vacuum distillation of 𝑌 gives H₂O₂. The number of peroxy (O - O) bonds present in 𝑋 and 𝑌 respectively are

1. Zero, 1

2. Zero, zero

3. 1.1

4. 1.2

When sodium reacts with excess of oxygen, oxidation number of oxygen changes from

1. –1 to –2

2. 0 to –2

3. +1 to –1

4. 0 to –1

Which of the following is not correct regarding the electrolytic preparation of H₂O₂?

1. Lead is used as cathode

2. Sulphuric acid undergoes oxidation

3. Hydrogen is liberated at anode

4. 50% H₂SO₄ is used

Which one is the most stable carbonate?

1. BaCO₃

2. MgCO₃

3. CaCO₃

4. BeCO₃

for the reaction Ag₂O(s) ➜ 2Ag(s) + ½O₂(g),
which one of the following is true -

1. ∆H = ∆E

2. ∆H >∆E

3. ∆H < ∆E

4. ∆H = ½∆E

Which of the following are isoelectronic with one
another ?

1. K+ and O

2. Na+ and K+

3. Na+ and Ne

4. Ne and O

A mixture of 2 moles of carbon monoxide and one
mole of oxygen in a closed vessel is ignite to get
carbon dioxide. If ∆H is the enthalpy change and
∆E is the change in internal energy, then -

1. Not definite

2. ∆H = ∆E

3. ∆H > ∆E

4. ∆H < ∆E

Which of the following is isoelectronic with N₂O

1. N₂O₅

2. NO

3. CO

4. CO₂

The thermal stability of hydrides of oxygen family is in order :

1. H₂Po < H₂Te < H₂Se < H₂S < H₂O

2. H₂Po < H₂O < H₂Te < H₂Se < H₂S

3. H₂S < H₂O < H₂Te < H₂Se < H₂Po

4. H₂O < H₂S < H₂Te < H₂Se < H₂Po

The major binding force in silicon is

1. covalent bond

2. ionic bond

3. dipole-dipole attraction

4. induced dipole-dipole attraction

In which of the following molecule, the mesomeric effect is present ?

1. Only 1

2. Only 4

3. Only 2

4. Only 3

Oxygen has oxidation states of +2 in
the

1. H₂O

2. CO₂

3. OF₂

4. H₂O

Charge on a positron is equal to that of :

1. Electron

2. Neutron

3. Proton

4. Nucleon

Which of the following is always a whole number

1. Atomic weight

2. Equivalent weight

3. Atomic radii

4. Atomic number

Inductive effect involves :

1. delocalisation of σ-electrons

2. displacement of 𝝿-electrons

3. delocalisation of 𝝿-electrons

4. displacement of σ-electrons

Temporary hardness may be removed from water by adding

1. CaSO₄

2. Ca(OH)₂

3. CaCO₃

4. HCl

The angle strain in cyclobutane is

1. 29°16

2. 24°44

3. 19°22

4. 9°44

Which is not characteristic of 𝛑-bond:

1. 𝛑-bond are formed from hybrid orbitals

2. 𝛑-bond formed when a sigma bond already formed

3. 𝛑-bond results from lateral overlap of atomic orbitals

4. 𝛑-bond may be formed by the overlapping of p-orbitals

Which of the following mainly forms metal oxide on heating in air?

1. Cs

2. K

3. Na

4. Li

For CaCO₃(s) ∆ CaO(s) + CO₂(g) at 977°C, ∆H = 174 KJ/mol; then ∆E is -

1. 163.6 KJ

2. 160 KJ

3. 186.4 KJ

4. 180 KJ

Select the compound in which chlorine
is assigned the oxidation number +5

1. HCl

2. HClO₃

3. HClO₂

4. HClO₄

The difference between heats of reaction at
constant pressure and constant volume for the
reaction 2C₆H₆(I) + 15O₂(g) ➜12CO₂(g)+ 6H₂O(I) at 25°C in KJ is -

1. – 3.72

2. + 7.43

3. – 7.43

4. + 3.72

Solubility of the alkaline earth’s metal sulphates in water decreases in the sequence

1. Mg > Ca > Sr > Ba

2. Ca > Sr > Ba > Mg

3. Ba > Mg > Sr > Cr

4. Sr > Ca > Mg > Ba

The work done by a system is 8 J when 40 J heat is
supplied to it. The change in internal energy of the
system during the process -

1. – 32 J

2. 32 J

3. 48 J

4. 40 J

The ionic character of alkali metal chlorides follows the order:

1. LiCl > CsCl > NaCl > KCl

2. CsCl > KCl > NaCl > LiCl

3. LiCl > CsCl > NaCl > KCl

4. LiCl > KCl > NaCl > CsCl

The decomposition of H₂O₂ can be slowed down by the addition of small amount of phosphoric acid which acts as:

1. Inhibitor

2. Stopper

3. promoter

4. Detainer

IUPAC name of the element placed just after actinide series :-

1. Unnilpentium

2. Unnilquadium

3. Ununbium

4. Unniltrium

When H₂O₂ is added to acidic ferrous sulphate solutions:

1. Electrons are lost by Fe2+

2. Electrons are gained by Fe2+

3. Iron hydroxide precipitates

4. There is no loss or gain of electrons

Which of the following statement is wrong :-

1. 2nd period contain 8 elements

2. 3rd period contains 18 elements

3. 1st period contains two non metals

4. In p–block, metal, nonmetal and metalloids are present

Decreasing –I effect of given groups is :
(i) –CN (ii) –NO₂ (iii) –NH₂ (iv) –Cl

1. iii > ii > iv > i

2. iii > ii > i > iv

3. ii > i > iv > iii

4. ii > iii > iv > i

Oxidation state of Fe in Fe3O4 is

1. 4/5

2. 8/3

3. 3/2

4. 5/4

The atomic number of an element represents

1. Valency of element

2. Atomic weight of element

3. Number of neutrons in the nucleus

4. Number of protons in the nucleus

Pair of amphoteric hydroxides is

1. LiOH, Be(OH)₂

2. Be(OH)₂, Mg(OH)₂

3. Be(OH)₂, Zn(OH)₂

4. Be(OH)₂, B(OH)₂

For which of the following reactions ∆H is less than ∆E -

1. N₂(g) + O₂(g) ➜ 2NO(g)

2. C₁₂H₂₂O₁₁(s) + 6O₂(g) ➜ 6CO₂(g) + 6H₂O(l)

3. N₂O₄(g) ➜ 2NO₂(g)

4. 2SO₂(g) + O₂(g) ➜ 2SO₃(g)

Solution of sodium metal in liquid ammonia is strongly reducing due to the presence in solution of the following

1. Sodium hydride

2. Sodium atom

3. Solvated electrons

4. Sodium hydroxide

In XeO3 and XeF6
the oxidation state of Xe is

1. + 6

2. + 1

3. + 3

4. + 4

The sum of protons, electrons and neutrons in the heaviest isotope of hydrogen is

1. 5

2. 3

3. 6

4. 4

RbO₂ is

1. Peroxide and paramagnetic

2. Superoxide and diamagnetic

3. Superoxide and paramagnetic

4. Peroxide and diamagnetic

Identify the statement that is not correct as far as structure of diborane is concerned.

1. The hydrogen atoms are not in the same plane in diborane.

2. Each boron atom forms four bonds in diborane.

3. There are two bridging hydrogen atoms and four terminal hydrogen atoms in diborane.

4. All B-H bonds in diborane are similar.

In lab H₂O₂ is prepared by

1. Conc. H₂SO₄ + Na₂O₂

2. H₂ + O₂

3. Cold H₂SO₄ + BaO₂

4. HCl + BaO₂

What is the net charge on ferrous ion

1. + 5

2. + 3

3. + 2

4. + 4

A disease caused by eating fish contaminated by industrial waste, containing mercury compounds, is called as

1. Hashimotos disease

2. Osteosclerosis

3. Minamata disease

4. Brights disease

Which of the following acts as both reducing and oxidising agents?

1. KMnO₄

2. H₂O₂

3. H₂SO₄

4. KOH

In which of the following delocalisation of 𝝿-electron is possible.

1. CH₂ = CH – CH₂ – CHO

2. CH₂ = CH – CH₂ – CH = CH₂

3. None of these

4. CH₂ = CH – CH = O

Sodium atom differs from sodium ion in the number of

1. Neutrons

2. Protons

3. Electron

4. Does not differ

Which of the following reactions produces hydrogen?

1. Na₂O₂ + 2HCl

2. Mg + H₂O

3. BaO + HCl

4. H₂S₄O₈ + H₂O

Radioactive isotope of hydrogen is

1. Ortho hydrogen

2. Tritium

3. Deuterium

4. Para hydrogen

Which of the following is an amphoteric hydroxide?

1. Mg(OH)₂

2. Be(OH)₂

3. Ca(OH)₂

4. Sr(OH)₂

Nitrobenzene on reaction with conc. HNO₃/H₂SO₄ at 80 – 100°C forms which one of the following products?

1. 1, 4-Dinitrobenzene

2. 1, 2-Dinitrobenzene

3. 1, 2, 4-Trinitrobenzene

4. 1, 3-Dinitrobenzene

Which of the following has highest bond strength :

1. HCl

2. HI

3. HBr

4. HF

The acidified solution of FeCl₃ is reduced by passing:

1. O₂

2. ordinary H₂

3. nascent H

4. H₂

Arrange the following groups in order of decreasing –m effect.
(i) NO₂ (ii) COOH (iii) CN (iv) CHO

1. i > iii > ii > iv

2. i > ii > iii > iv

3. iv > iii > ii > i

4. i > iii > iv > ii

Manufacture of H₂ is made by:

1. Bosch process

2. From natural gas

3. Lane’s process

4. All of these

In which of the excitation state of chlorine ClF₃ is formed:

1. In third excitation state

2. In group state

3. In second excitation state

4. In first excitation state

Which one of the following pairs represents
isobars -

1. 19K40 and 19K39

2. 19K40 and 18Ar40

3. 12Mg24 and 12Mg25

4. 2He3 and 2He4

Solubilities of group (II) carbonates, sulphates, phosphates decreases down the group, this is due to

1. Entropy of solution formation

2. Lattice energies of solids

3. Inter-ionic attraction

4. Hydration energy of cations

The lowest alkene, that is capable of exhibiting geometrical isomerism is

1. But – 2 – ene

2. But – 1– ene

3. Ethene

4. Propene

The charge on the atom having 17 protons, 18
neutrons and 18 electrons is

1. +1

2. -2

3. Zero

4. -1

A signature written with carbon pencil weights 1 mg. What is the number of carbon atoms present in the signature?

1. 5.02 × 1020

2. 6.02 × 1020

3. 0.502 × 1020

4. 5.02 × 1023

Your score is

Chapters Wise MCQs..

Chapter 1: The Solid State.
Chapter 2: Solutions.
Chapter 3: Electrochemistry.
Chapter 4: Chemical Kinetics.
Chapter 5: Surface Chemistry.
Chapter 6: General Principles and Processes of Isolation of Elements.
Chapter 7: d & f Block Elements.
Chapter 8: Coordination Compounds.
Chapter 9: Haloalkanes and Haloarenes.
Chapter 10: Alcohols, Phenols, and Ethers.
Chapter 11: Aldehydes, Ketones, and Carboxylic Acids.
Chapter 12: Amines.
Chapter 13: Biomolecules.
Chapter 14: Polymers.
Chapter 15: Chemistry in Everyday Life.