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11th CBSE

IMPORTANT

Earn 100

Calorific value of hydrogen gas is $- 143 kJ g^{- 1}$ . The standard enthalpy of formation of $H_{2} O$ will be

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Important Questions on Thermodynamics

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>Competition Focus>Q 38

The heat evolved in the combustion of

112 L

of water gas (

CO + H_{2}

in the ratio of

1 : 1

by volume) is (Given that heats of combustion of

H_{2}

and

CO

are

- 241 \cdot 8

and

- 283 kJ {mol}^{- 1}

respectively)

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>Competition Focus>Q 39

Heat of dissociation of acetic acid is

0.30 kcal {mol}^{- 1}

, and the heat of neutralization of

Ca {(OH)}_{2}

13.7 k cal {mol}^{- 1}

. Hence, enthalpy change when

1 mole

Ca (OH)_{2}

is completely neutralized by acetic acid would be

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>Competition Focus>Q 40

The enthalpy of neutralization for

Ca {(OH)}_{2}

13.7 kcal {mol}^{- 1}

. The enthalpy change when

1 L

1 M H_{2} {SO}_{4}

is completely neutralized by

1 L

1 M Ca (OH)_{2}

will be

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>Competition Focus>Q 41

0.06 mole

{KNO}_{3}

is added to

100 {cm}^{3}

of water at

298 K

. The enthalpy of

{KNO}_{3}

aq. solution is

35.8 kJ {mol}^{- 1}

. After the solute is dissolved, the temperature of the solution will be-

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>Competition Focus>Q 42

C_{2} H_{4}

, formation of (

C = C

) and (

C - C

) is

- 590 kJ / mole

and

- 331 kJ / mole

respectively. What is enthalpy change when ethylene polymerizes to form polythene?

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>Competition Focus>Q 43

150 kJ

of energy is needed for muscular work to walk a distance of one

km

, then how much of glucose one has to consume to walk a distance of five

km

, provided only

30 %

energy is available for muscular work. The enthalpy of combustion of glucose is

3000 kJ {mol}^{- 1}

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>Competition Focus>Q 44

The bond dissociation energies for

{Cl}_{2}

I_{2}

and

ICl

are

242 \cdot 3

151 \cdot 0

and

211 \cdot 3 kJ / mole

respectively. The enthalpy of sublimation of iodine is

62 \cdot 8 kJ / mole

. What is the standard enthalpy of formation of

ICl (g)

nearly equal to ?

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 7 - Thermodynamics>Competition Focus>Q 45

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

$\frac{1}{2} {Cl}_{2} (g) \overset{\frac{1}{2} ∆_{disso} H^{⊙}}{\to} Cl (g) \overset{∆_{eg} H^{⊙}}{\to} {Cl}^{-} (g) \overset{∆_{hyd} H^{⊙}}{\to} {Cl}^{-} (aq)$

The energy involved in the conversion of $\frac{1}{2} {Cl}_{2} (g) to {Cl}^{-} (aq)$ (using the data, $∆_{disso} {H^{⊙}}_{{Cl}_{2}} = 240 KJ {mol}^{- 1}$ , $∆_{eg} H = - 349 KJ {mol}^{- 1}$ $∆_{hyd} H_{Cl}^{⊙} - = - 381 KJ {mol}^{- 1}$ ) will be

Calorific value of hydrogen gas is -143 kJ g-1. The standard enthalpy of formation of H2O will be

Important Questions on Thermodynamics

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Calorific value of hydrogen gas is $- 143 kJ g^{- 1}$ . The standard enthalpy of formation of $H_{2} O$ will be