Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-I (Conceptual Questions)>Q 156

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The enthalpy changes at $298 K$ in successive breaking of $O - H$ bond of $HOH$ are

$H_{2} O_{(g)} \to H_{(g)} + {OH}_{(g)}; ΔH = 498 kJ {mol}^{- 1}$

${OH}_{(g)} \to H_{(g)} + O_{(g)}; ΔH = 428 kJ {mol}^{- 1}$

The bond enthalpy of $O - H$ bond is

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Important Questions on Thermodynamics

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-I (Conceptual Questions)>Q 157

If

Δ H_{i}^{o}

of

{ICl}_{(g)}, {Cl}_{(g)},

and

I_{(g)}

is

17.57, 121.34

and

106.96 J {mol}^{- 1}

respectively. Then bond dissociation energy of

ICl

bond is -

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-I (Conceptual Questions)>Q 158

Heat of dissociation of benzene to elements is

5535

kJ {mol}^{- 1}

. The bond enthalpies of

C - C

,

C = C

and

C - H

are

347.3, 615.0

and

416.2

kJ

respectively. Magnitude resonance energy of benzene is:

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-I (Conceptual Questions)>Q 163

$S_{(rhombic)} + O_{2 (g)} ⟶ {SO}_{2 (g)}$ ; $ΔH = - 297.5$ $kJ$

$S_{(monoclinic)} + O_{2 (g)} ⟶ {SO}_{2}_{(g)}$ ; $ΔH = - 300$ $kJ$

The data can predict that:

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-I (Conceptual Questions)>Q 164

The heat of combustion of yellow phosphorus and red phosphorus are

- 9.91 K J / m o l

and

- 8.78 K J / m o l

respectively. The heat of transition from yellow phosphorus to red phosphorus is -

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-I (Conceptual Questions)>Q 165

For the change,

C_{d i a m o n d} \to C_{g r a p h i t e}; Δ H = - 1.89 k J,

if

6 g

of diamond and

6 g

of graphite are separately burnt to yield

C O_{2}

, the heat liberated in first case is

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-I (Conceptual Questions)>Q 166

$2 {CO}_{(g)} + O_{2 (g)} ⟶ 2 {CO}_{2 (g)} + X kJ$

In the above equation, $X$ $kJ$ refers to:

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-I (Conceptual Questions)>Q 167

Which of the following reactions represent

ΔH

(hydration):

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Beta Question Bank for Medical: Chemistry>Chapter 4 - Thermodynamics>EXERCISE-I (Conceptual Questions)>Q 168

ΔH

for the reaction,

I (g) + I (g) \to I_{2} (g)

will be: