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 |
 63%
From NCERT
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Select the correct option based on statements below:
Assertion (A): Combustion is an exothermic process.
Reason (R): Combustion is a spontaneous process.
 
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:  Thermochemistry |
 58%
From NCERT
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Select the correct option based on statements below:
Assertion (A):  Total enthalpy change of a multistep process is the sum of  ∆H1 + ∆H2 + ∆H3 + . . . . .
Reason (R):  When heat is absorbed by the system, the sign of q is taken to be negative.
 
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:  First Law of Thermodynamics |
 78%
From NCERT
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Select the correct option based on statements below:
Assertion (A): ∆H is positive for endothermic reactions.
Reason (R): If the total enthalpy of reactants and products are Hr & Hp respectively, then for an endothermic reaction
HR < HP.
 
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:  Enthalpy & Internal energy |
 77%
From NCERT
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Select the correct option based on statements below:
Assertion (A): Work done in an irreversible isothermal process at constant volume is zero.
Reason (R):  Work is assigned a negative sign during expansion and is assigned a positive sign during compression.
 
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:  First Law of Thermodynamics |
 76%
From NCERT
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Select the correct option based on statements below:
Assertion (A):  Specific heat is an intensive property.
Reason (R):  Heat capacity is an extensive property.
 
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:  Classification of System, Extensive & Intensive Properties |
 71%
From NCERT
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Links
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Select the correct option based on statements below:
Assertion (A): Cdiamond → Cgraphite ∆H and  ∆U  are the same for this reaction.
Reason (R): Entropy increases during the conversion of diamond to graphite.
 
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:  Enthalpy & Internal energy |
 64%
From NCERT
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A sample containing 1.0 mol of an ideal gas is expanded isothermally and reversible to ten times of its original volume in two separate experiments. The expansion is carried out at 300 K and at 600 K respectively. 

The correct statements among the following are-

a. Work done at 600 K is 20 times the work done at 300 K
b. Work done at 300 K is twice the work done at 600 K
c. Work done at 600 K is twice the work done at 300 K
d. ∆ U = 0  in both cases

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, d)

Subtopic:  First Law of Thermodynamics |
 80%
From NCERT
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For a given reaction - 2 Zn(s)+O2(g)2ZnO(s), 
H=-693.8 kJ mol-1

The correct statements among the following are :

a. The enthalpy of two moles of ZnO is less than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ
b. The enthalpy of two moles of ZnO is more than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ
c. 693 . 8   kJ mol -1  energy is evolved in the reaction
d. 693 . 8   kJ mol -1  energy is absorbed in the reaction

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, c)

Subtopic:  First Law of Thermodynamics |
 69%
From NCERT
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For the graph given below, it can be concluded that work done during the process shown will be-

1. Zero 2. Negative
3. Positive 4. Cannot be determined
Subtopic:  First Law of Thermodynamics |
 65%
From NCERT
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