Match the following process with entropy change

 Reaction Entropy change A. A liquid vaporizes 1. $∆\mathrm{S}=0$ B. Reaction is non-spontaneous at all temperatures and $∆\mathrm{H}$ is positive 2. $∆\mathrm{S}=\mathrm{positive}$ C. Reversible expansion of an ideal gas 3. $∆\mathrm{S}=\mathrm{negative}$

Codes

 A B C 1. 2 3 1 2. 1 2 3 3. 1 3 2 4. 3 2 1
Subtopic:  Spontaneity & Entropy |
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Match the following parameters with a description for spontaneity.

 $$\Delta$$ (Parameters) $$\Delta r\ H^⊝$$ $$\Delta r\ S^⊝$$$$\Delta r\ G^⊝$$ Description A. + - + 1. Non-spontaneous at high temperature B. - - + at high T 2. Spontaneous at all temperatures C. - + - 3. Non-spontaneous at all temperatures

Codes

 A B C 1. 3 1 2 2. 1 2 3 3. 1 3 2 4. 3 2 1
Subtopic:  Spontaneity & Entropy |
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Match the following:

 A. Entropy of vaporization 1. Decreases B. K for a spontaneous process 2. Is always positive C. Crystalline solid state 3. Lowest entropy D. $∆\mathrm{U}$ in an adiabatic expansion of ideal gas 4. $\frac{∆{\mathrm{H}}_{\mathrm{vap}}}{{\mathrm{T}}_{\mathrm{b}}}$

Codes

A            B          C           D

1.       2, 4         2           3            1

2.        1            2           3            4

3.        1           4, 3        3            2

4.       4             3          3, 1         2

Subtopic:  Spontaneity & Entropy | Gibbs Energy Change |
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Assertion: Spontaneous process is an irreversible process and may be reversed by some external agency.

Reason: A decrease in enthalpy is a contributing factor to spontaneity.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true but the reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but the reason is true.

Subtopic:  Spontaneity & Entropy |
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Assertion: A liquid crystallises into a solid and is accompanied by a decrease in entropy.

Reason: In crystals, molecules organise in an ordered manner.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true but the reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but the reason is true.

Subtopic:  Spontaneity & Entropy |
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The entropy change can be calculated by using the expression $∆\mathrm{S}=\frac{{\mathrm{q}}_{\mathrm{rev}}}{\mathrm{T}}$. When water freezes in a glass beaker, the correct statement among the following is -

1. $∆\mathrm{S}$ (system) decreases but $∆\mathrm{S}$ (surroundings) remains the same

2. $∆\mathrm{S}$ (system) increases but $∆\mathrm{S}$ (surroundings) decreases

3. $∆\mathrm{S}$ (system) decreases but $∆\mathrm{S}$ (surroundings) increases

4. $∆\mathrm{S}$ (system) decreases but $∆\mathrm{S}$ (surroundings) also decreases

Subtopic:  Spontaneity & Entropy |
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Which of the following is not correct?

1. $∆\mathrm{G}$ is zero for a reversible reaction.

2. $∆\mathrm{G}$ is positive for a spontaneous reaction.

3. $∆\mathrm{G}$ is negative for a spontaneous reaction.

4. $∆\mathrm{G}$ is positive for a non-spontaneous reaction.

Subtopic:  Spontaneity & Entropy |
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The processes among the following that occur spontaneously are -

(a) The flow of heat from colder to a warmer body

(b) Gas in a container contracting into one corner

(c) Gas expanding to fill the available volume

(d) Burning carbon in oxygen to give carbon dioxide

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, d)

Subtopic:  Spontaneity & Entropy |
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