Assertion(A): Decrease in free energy causes a spontaneous reaction.
Reason(R): Spontaneous reactions are invariably exothermic reactions.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true and R is false.
4. A and R both are false.
Subtopic:  Spontaneity & Entropy |
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Assertion(A): A process for which \(\Delta S_{system} > 0 \) as well as \(\Delta H > 0 \) passes from non-spontaneous to spontaneous state as temperature is increased.
Reason(R): At higher temperatures, \(T \Delta S \) exceeds \(\Delta H \).

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true and R is false.
4. A and R both are false.
Subtopic:  Spontaneity & Entropy |
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Assertion: Dissolution of sugar in water proceeds via an increase in entropy.

Reason: Entropy decreases, when an egg is boiled hard.

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

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

3. Assertion is a true statement but reason is false.

4. Both assertion and reason are false statements.

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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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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The incorrect statement(s) among the following statements is/are -

(i) When liquid crystallizes into a solid, entropy increases

(ii) When the temperature of a crystalline solid is raised from 0 K to 115 K then entropy increases

 (iii) 2NaHCO3 (s)  Na2CO3 (s) + CO2(g) + H2O(g); Entropy  increases

(iv) H2(g)  2H(g); Entropy  decreases

1. (i), (iv)

2. (ii), (iv)

3. (iii), (iv)

4. (i), (iii)

Subtopic:  Spontaneity & Entropy |
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An enthalpy diagram for a particular reaction is given below:

 

The correct statement among the following is-

1. Reaction is spontaneous

2. Reaction is non-spontaneous

3. Cannot predict spontaneity of the reaction from the graph given above

4. None of the above

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. U in an adiabatic expansion of ideal gas

4. HvapTb

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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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 process with entropy change

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