+2 Chemistry

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Class 12 FULL Chemistry

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

Hybridisation of carbon in ethane is

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

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

Order of esterification of alcohols are

One mole of ethyl acetate on treatment with an excess of LiAlH4 in dry ether and subsequent acidification produces

A solid X+Y- has a bcc structure. If the distance of closest approach between the two atoms is 173 pm, the edge length of the cell is :

The significance of leaching in the extraction of aluminium is

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

Molar conductivities (Λºm) at infinite dilution of NaCl, HCl and CH3COONa are 126.4, 425.9 and 91.0 S cm2 mol-1 respectIvely. Λºm for CH3COOH will be :

Which of the following solution containing components A and B follows Raoult’s law :

Which of the following does not undergo Cannizzarro’s reaction?

The specific conductance of a salt of 0.01 M concentration is 1.061 × 10-4 molar conductance of the same solution will be :

Which of the following complex species is not expected to exhibit optical isomerism?

Glycosidic linkage is an

Identify the correct IUPAC name

A mixture has 18 g water and 414 g ethanol. The mole fraction of water in mixture is (assume ideal behaviour of the mixture) :

Which of the following gases present in a polluted area will be adsorbed most easily on the charcoal gas mask?

Which of the following is not an element of first transition series?

Which of the following alcohols will give the most stable carbocation during dehydration?

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

A zero order reaction is one whose rate is independent of ……

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 ?

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 :

Which of the following is a narcotic analgesic?

The crystal system for which a ≠ b ≠ c and α = β = γ = 90o
is said to be :

Lanthanoid contraction is due to increase in

The radius of an atom of an element is 500 pm. If it crystallises as a face centred cubic lattice, the length of the
side of unit cell is :

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

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

Which of the following will not show geometrical isomerism?

Arrange the following polymers is an increasing order of intermolecular forces: fibre, plastic, elastomer

Which of the following is not correct for enzyme catalysis?

Amides may be converted into amines by a reaction named after

Solid CO2 is an example of :

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

What are the hydrolysis products of sucrose?

Which of the following shows maximum number of isomers?

Which of the following compounds has tetrahedral geometry?

Benzoyl Chloride on reduction with H2/Pd-BaSO4 produces

Which of the following metals is not extracted by leaching?

The main cause of acidity in the stomach is

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 ?

Bromination of methane in presence of sunlight is a

A colloidal system is which liquid is dispersed phase and solid is dispersion medium is classified as

Nitrogen atom of amino group is ……… hybridised.

Composition of Ziegler-Natta catalyst is

Which of the following compounds will undergo Cannizzaro 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

Terfenadine is commonly used as

What is the basic formulae for starch?

For the reaction of 4A + B→ 2C + D. Which of the following statement is not correct?

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

_____does not affect the rate of reaction.

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

The specific conductance of a 0.01 M solution of KCl is 0.0014 ohm-1 cm-1 at 25°C, Its equivalent conductance
(cm2 ohm-1 equiv-1 M) is :

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?

Number of π bonds in ethyne is

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….

Propanone can be prepared from ethyne by

How do we separate two sulphide ores by froth floatation method?

Carbohydrates are stored in human body as the polysaccharide

Fe3+ ion is more stable than Fe2+ ion because

MCQ Questions for Class 12 Chemistry Chapter 13 Amines with Answers 5
in the above reaction is

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

Invert sugar is

Which of the following is not a neutral ligand?

Dacron is an example of

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

Which of the following reagents are not correctly matched with the reaction?

Concentration of sulphide ore is done by

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 :

Which one of the following reducing agents is likely to be most effective in bringing about the following change?
MCQ Questions for Class 12 Chemistry Chapter 13 Amines with Answers 3

The powdered ore is agitated with water or washed with running stream of water. The heavy ore particles and lighter impurities are separated. This method of concentration is known as

Volume of one mole of any gas at NTP is

The use of chemicals for therapeutic effect is called

A compound formed by elements A and B crystallises in the cubic structure, where A atoms are present at the
corners of a cube and B atoms are present at the face centres. The formula of the compound is :

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

Which one of the following is not correct order of boiling points of the alkyl/aryl halides?

1-Phenylethanol can be prepared by the reaction of benzaldehyde with

The oxidation of toluene to benzaldehyde by chromyl, chloride is called

Which of the following types of metals make the most efficient catalyst?

Natural rubber is a polymer of

A compound X with the molecular formula C2H8O can be oxidised to another compound Y whose molecular formulae is C3H6O2. The compound X may be

Ore of aluminium is

The a-and p-forms of glucose are

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?

Which of the following compounds will give a coloured crystalline compound with
MCQ Questions for Class 12 Chemistry Chapter 12 Aldehydes, Ketones and Carboxylic Acids with Answers 1

The specific conductance of a N/10 KCl at 25°C is 0.0112 ohm-1 cm-1. The resistance of cell containing solution at the same temperature was found to be 55 ohms. The cell constant will be

Which of the following isomers will give white precipitate with BaCl2 solution?

An ore of tin containing FeCrO4 is concentrated by

MCQ Questions for Class 12 Chemistry Chapter 14 Biomolecules with Answers
Identify Z.

Which of the following compounds does not react with NaHSO3?

Which of the following shows negative deviation from Raoult's law ?

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

Vapours of an alcohol X when passed over hot reduced copper, produce an alkene, the alcohol is

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

Common impurities present in bauxite are

The most suitable reagent for the conversion of RCH2OH → RCHO is

Organic compound must contain an element

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Class 11 FULL Chemistry

These MCQs are intended for checking your ChemistryAll Chapters  knowledge!!

for more new questions refresh this page !!

For the gas phase reaction , 2NO (g) ⇌ N2(g) + O2(g) , ∆H = -43.5 K cal , which one of the following is true for
N2(g) + O2(g) ⇌ 2NO(g)

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

Which is true for the combustion of sucrose
(C12H22O11) at 25°C -

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

Pure methane can be prepared by

Gas ⟶ liquid, conversion is possible at

Oxidation numbers of two Cl atoms in bleaching powder, CaOCl2 are

The mass of an atom is constituted mainly by

Which of the following elements can-not exhibit sp3d hybridization state:
(a) C   (b) P   (c) Cl   (d) B
Correct answer is:

Molecular weight of heavy water is

In XeO3 and XeF6
the oxidation state of Xe is

The ortho and para hydrogen possess:

The Initial pressure of COCl2 is 1000 torr . The total pressure of the system becomes 1500 torr when the equilibrium
COCl2 (g) ⇌ CO (g) + Cl2 (g) is attained at constant temperature.
The value of Kp of a reaction is

Which of the following is not true?

Radioactive isotope of hydrogen is

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

Hydrogen readily combines with non-metals and thus it shows its

Which of the following will weigh maximum amount-

Which of the following statements is incorrect for anode rays ?

Which of the following gives CO2 on heating?

The false statement among the followings:

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

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

Which of the following statements are correct ?
(a) NH3 has higher boiling point than SbH3 dues to H-bonding .
(b) NH3 produces deep blue colouration with soluble copper (II) salts.
(c) Pure nitrogen can be obtained by the thermal decomposition of sodium or barium azide.
(d) N2 is used for creating inert atmosphere in iron and steel industry.

_______ of a crystal is reflected in the magnitude of its melting point.

Synthesis of ethanal commercially from which of the following reagent is the part of green chemistry?

Hydrogen acts as a reducing agent and thus resembles

The reactions , PCl5 (g) ⇌ PCl3 (g) + Cl2 (g) and COCl2 (g) ⇌ CO (g) + Cl2 (g) are simultaneously in equilibrium in an Equilibrium box at constant volume . A few moles of CO(g) are later introduced into the vessel . After sometime the new Equilibrium Concentration of

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

Which of the following is strongest base?

Sodium atom differs from sodium ion in the number of

Which salt of heating does not give brown coloured gas?

Which pair does not show hydrogen isotopes?

Oxidation number of As atoms in
H3AsO4 is

Hydrocarbon containing following bond is most reactive

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

Oxidation state of Fe in Fe3O4 is

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

For a reaction N2 + 3H2 = 2NH3 , the value of Kc would depend upon

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 -

Which is most harmful for life on globe?

Oxidation number of N in NH3 is

The alum used for purifying water is

Manufacture of H2 is made by:

In a closed System : A (s) ⇌ 2B(g) + 3C (g) if the partial pressure of C is doubled , then partial pressure of B will be√2

Which statement is wrong for the long form of periodic table :-

Hydrogen loses its electron to form H+ion. In this respect it resembles to:

Select the incorrect statement.

Nitrogen show different oxidation
states in the range

Charge on a positron is equal to that of :

The law of triads is applicable to :-

The position of double bond in alkenes can be located by :

Resonance structures of a molecule do not have :

Which of the following sets of elements follows Newland's octave rule :-

Which of the following are arranged in increasing order of solubilities?

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

p – p overlapping will be observed in the molecules of:

A sigma bond is formed by the overlapping of:

Which of the following has the highest solubility product?

Which is the correct order of inductive effect ?

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

The strength of bonds by 2s – 2s, 2p – 2p and 2p – 2s overlapping has the order:

Heat of reaction for, CO(g) + ½O2(g) ➜ CO2(g) at
constant V is – 67.71 K cal at 17°C. The heat of reaction at constant P at 17°C is -

Rank the following compounds in order of decreasing electron density in the benzene nucleus.
(I) Chlorobenzene (II) 4-nitrochlorobenzene (III) 2, 4-dinitrochlorobenzene (IV) 2, 4, 6-trinitrochlorobenzene

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

Domestic waste mostly constitutes

Hyperconjugation effect involves :

In the case of alkali metals, the covalent character decreases in the order

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

Which of the following reactions produces hydrogen?

Which of the following oxides is amphoteric?

Thermal stability of hydrides of first group elements follows the order

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

From the B2H2 all the following can be prepared except :

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

The oxidation number of fluorine in F2O is

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 -

The fraction of volume occupied by the nucleus
with respect to the total volume of an atom is

Which one of the following on heating will not give CO2?

Consider the following reaction,
C (s , diamond) ⇌ C (s, graphite) + heat and choose the correct option

Which of the following statement is correct?

H2 acts as an oxidant in its reaction with:

Oxygen has oxidation states of +2 in

If the table of atomic masses were established with the oxygen atom and assigned value of 100, then the mass of
carbon atom would be, approximately :-

H2O2 on treatment with chlorine gives:

Which of the following substances can be used for drying non-acidic gas?

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

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

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

Which is not characteristic of 𝛑-bond:

The gas A2 in the left flask allowed to react with gas B2 present in right flask as

A2 (g) + B2 (g) ⇌ 2AB (g) ; Kc = 4 at 27℃

What is the concentration of AB when Equilibrium is established ?

Which of the following is paramagnetic?

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

20 ml of O2 contracts to 17 ml when subjected to silent electric discharge in an Ozoniser .What is the volume of O2 formed at equilibrium ?

Which of the following are isoelectronic with one
another ?

The mass charge ratio for A+
ion is 1.97 × 10-7 kg C-1. Calculate the mass of A atom.

2 – Phenylpropene on acidic hydration gives

The ratio between the neutrons in C and Si with respect to atomic masses 12 and 28 is

Which of the following is most soluble in water?

Which of the following set of elements belongs to same period :-

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