Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>TEST YOUR GRIP>Q 6

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The lattice enthalpy and hydration enthalpy of four compounds are given below:

Compounds
Lattice enthalpy (in $kJ {mol}^{- 1}$ )
Hydration enthalpy (in $kJ {mol}^{- 1}$ )

$P$ $+ 780$ $- 920$

$Q$ $+ 1012$ $- 812$

$R$ $+ 828$ $- 878$

$S$ $+ 632$ $- 600$

The pair of compounds which is soluble in water is

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Important Questions on Thermodynamics

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11th CBSE

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Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>TEST YOUR GRIP>Q 7

The standard enthalpies of formation of

A : ({NH}_{3}), B : ({CO}_{2}), C : (HI)

and

D : ({SO}_{2})

are respectively

- 46.19, - 393.4, + 24.94

and

- 296.9 kJ {mol}^{- 1}

respectively. The increasing order of their stability is

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Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>TEST YOUR GRIP>Q 8

The species which by definition has ZERO standard molar enthalpy of formation at

298 K

is

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Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>TEST YOUR GRIP>Q 9

Thermodynamically, the most stable form of carbon is

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Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>TEST YOUR GRIP>Q 10

The sublimation energy of

I_{2} (s)

is

57.3 kJ {mol}^{- 1}

and the enthalpy of fusion is

15.5 kJ {mol}^{- 1}

. The enthalpy of vaporization of

I_{2}

is

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>TEST YOUR GRIP>Q 11

Given that,

$C + O_{2} \to {CO}_{2}, ∆ H ° = - x kJ$ .

$2 CO + O_{2} \to 2 {CO}_{2}, ∆ H ° = - y kJ$ .

The enthalpy of formation of carbon monoxide will be

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Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>TEST YOUR GRIP>Q 12

If the bond energies of

H - H, Br - Br

and

H - Br

are

433 kJ {mol}^{- 1}, 192 kJ {mol}^{- 1}

and

364 kJ {mol}^{- 1}

respectively.

∆ H °

for reaction

H_{2} (g) + {B r}_{2} (g) \to 2 H B r (g)

is

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>TEST YOUR GRIP>Q 13

Predict the sign of

∆ S °

for the following reaction:

2 H_{2} S (g) + 3 O_{2} (g) \to 2 H_{2} O (g) + 2 {SO}_{2} (g) .

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>TEST YOUR GRIP>Q 14

Which one of the following demonstrates a decrease in entropy?