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Q1:

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 but (R) is False.
4.	(A) is False but (R) is True.

Subtopic: Spontaneity & Entropy |

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Q2:

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 but (R) is False.
4.	Both (A) and (R) are False.

Subtopic: Spontaneity & Entropy |

86%

From NCERT

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2

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Q3:

Select the correct option based on statements below:

Assertion (A):	Dissolution of sugar in water proceeds via an increase in entropy.
Reason (R):	Entropy decreases, when an egg is boiled hard.

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 but (R) is false.
4.	Both (A) and (R) are false.

Subtopic: Spontaneity & Entropy |

66%

From NCERT

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Q4:

Select the correct option based on statements below:

Assertion (A):	A liquid crystallizes into a solid and is accompanied by a decrease in entropy.
Reason (R):	In crystals, molecules organize in an ordered manner.

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 but (R) is False.
4.	(A) is False but (R) is True.

Subtopic: Spontaneity & Entropy |

84%

From NCERT

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4

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Q5:

Select the correct option based on statements below:

Assertion (A):	Spontaneous process is an irreversible process and may be reversed by some external agency.
Reason (R):	A decrease in enthalpy is a contributing factor to spontaneity.

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 but (R) is False.
4.	(A) is False but (R) is True.

Subtopic: Spontaneity & Entropy |

59%

From NCERT

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4

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Q6:

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)	2 NaHCO₃ (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 |

82%

From NCERT

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Q7:

An enthalpy diagram for a particular reaction is given below:

Which of the following statements is correct?

1.	Reaction is spontaneous
2.	Reaction is non-spontaneous
3.	The spontaneity of the reaction cannot be determined from the graph provided above.
4.	None of the above

Subtopic: Spontaneity & Entropy |

52%

From NCERT

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Q8:

Match the statements given in column 1 with corresponding characteristics given in column II and choose the correct option:

	Column -I		Column -II
A.	Entropy of vaporization	1.	Decreases
B.	K for a spontaneous process	2.	Is always positive
C.	Crystalline solid state	3.	Lowest entropy
D.	$\Delta U$ in an adiabatic expansion of ideal gas	4.	$\Delta H_{vap} \over T_b$

Codes:

Options:	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 |

81%

From NCERT

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Q9:

Match the following parameters with a description for spontaneity.

	$\Delta r\ H^⊝$	$\Delta r\ S^⊝$	$\Delta r\ G^⊝$		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 |

78%

From NCERT

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Q10:

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 |

81%

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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 \(\Delta H \).

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

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