Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Try This

EASY

12th Maharashtra Board

IMPORTANT

Earn 100

Write equation for bond enthalpy of $Cl - Cl$ bond in ${Cl}_{2}$ molecule $Δ_{r} H °$ for dissociation of ${Cl}_{2}$ molecule is $242.7 kJ {mol}^{- 1}$ .

Important Questions on Chemical Thermodynamics

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12th Maharashtra Board

IMPORTANT

Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Try This>Q i

State whether $ΔS$ is positive, negative or zero for the following reactions, $2 H_{2} (g) + O_{2} (g) ⟶ 2 H_{2} O (l)$ .

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12th Maharashtra Board

IMPORTANT

Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Try This>Q ii

State whether $ΔS$ is positive, negative or zero for the following reactions, ${CaCO}_{3} (s) \overset{∆}{\to} CaO (s) + {CO}_{2} (g)$ .

MEDIUM

12th Maharashtra Board

IMPORTANT

Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

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

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12th Maharashtra Board

IMPORTANT

Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

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

2.5

bar from an initial volume of

2.5 L

to a final volume of

4.5 L

. The change in internal energy,

ΔU

of the gas will be

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12th Maharashtra Board

IMPORTANT

Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

In which of the following, entropy of the system decreases?

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12th Maharashtra Board

IMPORTANT

Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

The enthalpy of formation for all elements in their standard states is

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12th Maharashtra Board

IMPORTANT

Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

Which of the following reactions is exothermic?

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12th Maharashtra Board

IMPORTANT

Chemistry Standard 12>Chapter 4 - Chemical Thermodynamics>Exercises>Q 1

6.24 g

of ethanol are vaporized by supplying

5.89 kJ

of heat. Enthalpy of vaporization of ethanol will be