Alpha Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>Exercise-4>Q 62

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Both the lattice energy $({ΔU}_{0})$ and hydration enthalpy $({ΔH}_{h})$ of a binary salt are negative quantities. However, if ${ΔU}_{o}$ is more negative than ${ΔH}_{h}$ , then:

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Important Questions on Thermodynamics

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Alpha Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>Exercise-4>Q 63

Preferred conditions for spontaneity in nature are

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Alpha Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>Exercise-4>Q 64

The change in free energy accompanied by the isothermal reversible expansion of

1

a mole of an ideal gas when it doubles its volume is

{ΔG}_{1} .

The change in free energy accompanied by a sudden isothermal irreversible doubling of the volume of

1

a mole of the same gas is

{ΔG}_{2} .

A ratio of

{ΔG}_{1}

to

{ΔG}_{2}

is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>Exercise-4>Q 65

The degree of freedom for

{NH}_{4} Cl_{(s)} ⇌ {NH}_{4} {Cl}_{(g)} ⇌ {NH}_{3 (g)} + {HCl}_{(g)}

will be

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Alpha Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>Exercise-4>Q 66

A reversible adiabatic expansion is an:

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Alpha Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>Exercise-4>Q 67

If the bond energies are as follows,

(i)

C - H = 413.8 kJ

(ii)

Cl - Cl = 238.0 kJ

(iii)

C - Cl = 327.2 kJ

(iv)

H - Cl = 429.8 kJ

the enthalpy of the reaction:

{CH}_{4} + 2 {Cl}_{2} ⟶ {CH}_{2} {Cl}_{2} + 2 HCl

will be:

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Alpha Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>Exercise-4>Q 68

For the isobaric gaseous reaction, the enthalpy change given by:

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Alpha Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>Exercise-4>Q 69

A reaction will never be spontaneous at any temperature and pressure if

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Alpha Question Bank for Engineering: Chemistry>Chapter 4 - Thermodynamics>Exercise-4>Q 71

The enthalpy of formation of carbon dioxide and water are

- 395 kJ

and

- 285 kJ,

respectively, and the enthalpy of combustion of acetic acid is

- 869 kJ .

Hence the enthalpy of formation of acetic acid is: