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Q. No.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
Codes:
Subtopic: Spontaneity & Entropy | Gibbs Energy Change |
82%
Level 1: 80%+
Hints
Select the correct option based on statements given below:
| Assertion (A): | Combustion of all organic compounds is an exothermic reaction. |
| Reason (R): | The enthalpies of all elements in their standard state are zero. |
| 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: Thermochemistry |
79%
Level 2: 60%+
Hints
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 |
60%
Level 2: 60%+
Hints
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 |
85%
Level 1: 80%+
Hints
Thermodynamics is not concerned about which of the following?
| 1. | Energy changes involved in a chemical reaction. |
| 2. | The extent to which a chemical reaction proceeds. |
| 3. | The rate at which a reaction proceeds. |
| 4. | The feasibility of a chemical reaction. |
Subtopic: Thermodynamics' Properties and process |
73%
Level 2: 60%+
Hints
Which among the following statements about open, closed, and isolated systems is correct?
| 1. | The presence of reacting species in a covered beaker represents an open system. |
| 2. | In a closed system, there is an exchange of both energy and matter between the system and its surroundings. |
| 3. | A system containing reactants in a closed vessel made of copper is an example of a closed system. |
| 4. | A system containing reactants in a thermos flask or any other closed, insulated vessel is an example of a closed system. |
Subtopic: Thermodynamics' Properties and process |
74%
Level 2: 60%+
Hints
Links
What happens to the specific heat of a gas when its volume is reduced to half of its initial value?
| 1. | Reduce to half | 2. | Be Doubled |
| 3. | Remain constant | 4. | Increase four times |
Subtopic: Classification of System, Extensive & Intensive Properties |
81%
Level 1: 80%+
Hints
Links
During the complete combustion of one mole of butane, 2658 kJ of heat is released. The thermochemical reaction for this change is:
| 1. | |
| 2. | |
| 3. | |
| 4. |
Subtopic: Enthalpy & Internal energy |
82%
Level 1: 80%+
Hints
The standard internal energy change of formation, ΔfU°, of CH₄(g) at a certain temperature is –393 kJ mol⁻¹.
Find the value of the standard enthalpy of formation (ΔfH°).
1. Zero
2. Less than ΔfU°
3. Greater than ΔfU°
4. Equal to ΔfU°
Find the value of the standard enthalpy of formation (ΔfH°).
1. Zero
2. Less than ΔfU°
3. Greater than ΔfU°
4. Equal to ΔfU°
Subtopic: Enthalpy & Internal energy |
64%
Level 2: 60%+
Hints
Links
Calculate the correct values of heat transfer (q), change in temperature (ΔT), and work done (W) for the free expansion of an ideal gas under adiabatic conditions.
1. q = 0, ΔT ≠ 0, W = 0
2. q ≠ 0, ΔT = 0, W = 0
3. q = 0, ΔT = 0, W = 0
4. q = 0, ΔT = 0, W ≠ 0
Subtopic: Thermodynamics' Properties and process |
71%
Level 2: 60%+
Hints
Links
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