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# Thermodynamics

#### Multiple Choice Questions

21.

If an endothermic reaction occurs spontaneously at constant temperature (T) and pressure (p), then which of the following is true?

C.

For endothermic reaction $∆\mathrm{H}$ is positive ie,  For a spontaneous process  thus, to maintain the value of

22.

An insulated container of gas has two chambers separated by an insulating partition. One of the chambers has volume V1 and contains ideal gas at pressure P1 and temperature T1. The other chamber has volume V2 and contains ideal gas at pressure P2 and temperature T2. If the partition is removed without doing any work on the gas, the final equilibrium temperature of the gas in the container will be

A.

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23.

Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated below

The energy involved in conversion of

• 152 kJ mol-

• -610 kJ mol-

• -850  kJ mol-

• -850  kJ mol-

B.

-610 kJ mol-

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24.

Condition for spontaneity in an isothermal process is

A.

The condition for spontaneity in an isothermal process is that $∆$G should be negative.

25.

The heat of formation of acetylene is :

• -1802 kJ

• +1802 kJ

• +237 kJ

• -800 kJ

C.

+237 kJ

26.

Which of the following is a path function?

• Internal energy

• Enthalpy

• Work

• Entropy

C.

Work

Internal energy, enthalpy and entropy are state functions but work and heat are path function.

27.

Hess's law is based on

• law of conservation of mass

• law of conservation of energy

• first law of thermodynamics

• None of the above

B.

law of conservation of energy

Hess's law is based upon law of conservation of energy ie, first law of thermodynamics.

28.

Enthalpy is equal to :

• ${\mathrm{T}}^{2}{\left[\frac{\partial \left(\mathrm{G}/\mathrm{T}\right)}{\partial \mathrm{T}}\right]}_{P}$

• $-{\mathrm{T}}^{2}{\left[\frac{\partial \left(\mathrm{G}/\mathrm{T}\right)}{\partial \mathrm{T}}\right]}_{\mathrm{P}}$

• ${\mathrm{T}}^{2}{\left[\frac{\partial \left(\mathrm{G}/\mathrm{T}\right)}{\partial \mathrm{T}}\right]}_{V}$

• $-{\mathrm{T}}^{2}{\left[\frac{\partial \left(\mathrm{G}/\mathrm{T}\right)}{\partial \mathrm{T}}\right]}_{\mathrm{V}}$

B.

$-{\mathrm{T}}^{2}{\left[\frac{\partial \left(\mathrm{G}/\mathrm{T}\right)}{\partial \mathrm{T}}\right]}_{\mathrm{P}}$

29.

For the reaction,

The heat of decomposition of water per mole is

• 286.6 kJ

• 573.2 kJ

• -28.66 kJ

• Zero

A.

286.6 kJ

Heat of decomposition of water is

30.

Standard entropy of X2, Y2 and XY3 are 60, 40 and 50 JK−1
mol −1, respectively. For the reaction,1/2X2 + 3/2Y2, ΔH = -30 kJ,to be at equilibrium, the temperature will be

• 1250 K

• 500 K

• 750 K

• 750 K

C.

750 K

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