Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 75

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Equal volumes of two monatomic gases, A and B, at same temperature and pressure are mixed. The ratio of specific heats (C_p/C_v) of the mixture will be:

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Important Questions on Thermodynamics

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 76

In which of the following reactions, standard reaction entropy change

(ΔS °)

is positive and standard Gibb's energy change

(ΔG °)

decreases sharply with increasing temperature:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 77

The enthalpy of fusion of water is

1.435 kCal / mol

. The molar entropy change for the melting of ice at

0 ° C

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 78

The correct thermodynamic conditions for the spontaneous reaction at all temperatures is

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 79

For a sample of perfect gas when its pressure is changed isothermally from

p_{i}

to

p_{f}

, the entropy change is given by

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 80

For a given reaction,

ΔH = 35.5 kJ {mol}^{- 1}

and

ΔS = 83.6 {JK}^{- 1} {mol}^{- 1}

.The reaction is spontaneous at :(Assume that

ΔH

and

ΔS

do not vary with temperature)

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 81

A gas is allowed to expand in a well insulated container against a constant external pressure of

2 \cdot 5 atm

from an initial volume of

2 \cdot 50 L

to a final volume of

4 \cdot 50 L

. The change in internal energy

∆ U

of the gas in joules will be

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 82

The bond dissociation energies of

X_{2}, Y_{2}

and XY are in the ratio of

1 : 0.5 : 1 . ΔH

for the formation of XY is

- 200 {kJmol}^{- 1}

. The bond dissociation energy of

X_{2}

will be ?

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Alpha Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>Exercise 4>Q 83

Assuming that water vapour is an ideal gas, the internal energy change

(∆ U)

when,

1 mole

of water is vapourised at

1 bar

pressure and

100 ° C

, (Given, molar enthalpy of vapourisation of water at

1 bar

and

373 K = 41 kJ

m o l^{- 1}

and

R = 8 .3 J {mol}^{- 1} K^{- 1}

) will be: