Thermodynamics 1

These MCQs are intended for checking your Chemistry subject, Chapter Thermodynamics knowledge.

The enthalpy of vaporisation of water at 100°C is
40.63 KJ mol-1. The value ∆E for this process would
be -

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 -

If a gas absorbs 100 J of heat and expands by 500 cm3
against a constant pressure of 2× 105 Nm-2, the change in internal energy is -

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

If work done by the system is 300 joule when 100
cal. heat is supplied to it. The change in internal
energy during the process is -

A system has internal energy equal to E1, 450 J of
heat is taken out of it and 600 J of work is done on it.
The final energy of the system will be -

Both q & w are ......... Function & q + w is a .....
function -

Which of the following statements is correct for the
reaction; CO(g) + ½O2(g) ➜ CO2(g) at constant
temperature and pressure

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

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

For a gaseous reaction,
A(g) + 3B(g) ➜ 3C(g) + 3D(g)
∆E is 17 Kcal at 27°C assuming R = 2 cal K-1
the value of ∆H for the above reaction is -

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 -

The heat of combustion of ethanol determined in a
bomb calorimeter is – 670.48 K. Cals mole-1
at 25°C. What is ∆H at 25°C for the reaction -

For the system S(s) + O2(g) ➜ SO2(g) -

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 -

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 -

The difference in ∆H and ∆E for the combustion of
methane at 25°C would be -

For which change ∆H ≠ ∆E -

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

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