Q. No.Identify correct match using Column I & Column II
| Column I | Column II | ||
| (i) | Spontaneous process | (a) | Isothermal and isobaric process |
| (ii) | \(\Delta H^\circ\) | (b) | \(\Delta H<0 \) |
| (iii) | \(\Delta T=0, \Delta P=0 \) | (c) | \(\Delta G<0 \) |
| (iv) | Exothermic process | (d) | (Bond energy of reactant) - (Bond energy of product) |
| I | II | III | IV | |
| 1. | c | d | a | b |
| 2. | b | a | c | d |
| 3. | d | b | c | d |
| 4. | a | d | b | c |
Subtopic: First Law of Thermodynamics | Spontaneity & Entropy | Gibbs Energy Change |
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JEE
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Match the reaction given in column I with appropriate options in column II
1. A-(r, t), B-(p, q, s), C-(p, q, s), D-(p, q, s, t)
2. A-(p, r, s), B-(r, s), C-(t), D-(p, q, t)
3. A-(r, t), B-(p, q,), C-(p, s), D-(p, t)
4. A-(r), B-(s), C-(p), D-(p, q, s, t)
| Column-I (Reaction) |
Column-II (Characteristics/ Property) |
||
| (A) | \( \mathrm{CO}_2(\mathrm{~s}) \rightarrow \mathrm{CO}_2(\mathrm{~g}) \) | (p) | Phase transition |
| (B) | \(\small\mathrm{CaCO}_3(\mathrm{~s}) \rightarrow \mathrm{CaO}(\mathrm{s})+\mathrm{CO}_2(\mathrm{~g})\) | (q) | Allotropic change |
| (C) | \( 2 \mathrm{H}^* \rightarrow \mathrm{H}_2(\mathrm{~g}) \) | (r) | \(\Delta H\) is positive |
| (D) | \( \mathrm{P}_{\text {(white, solid) }} \rightarrow \mathrm{P}_{\text {(red, solid) }} \) | (s) | \(\Delta S\) is positive |
| (t) | \(\Delta S\) is negative |
1. A-(r, t), B-(p, q, s), C-(p, q, s), D-(p, q, s, t)
2. A-(p, r, s), B-(r, s), C-(t), D-(p, q, t)
3. A-(r, t), B-(p, q,), C-(p, s), D-(p, t)
4. A-(r), B-(s), C-(p), D-(p, q, s, t)
Subtopic: Enthalpy & Internal energy | Spontaneity & Entropy |
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At 1 atm pressure,
\(\mathrm{\Delta S = 75 \ JK^{-1} mol^{-1} \ and \ \Delta H = 30 \ kJ mol^{-1} }\).
The temperature at which the reaction attains equilibrium is:
\(\mathrm{\Delta S = 75 \ JK^{-1} mol^{-1} \ and \ \Delta H = 30 \ kJ mol^{-1} }\).
The temperature at which the reaction attains equilibrium is:
| 1. | 400 K | 2. | 330 K |
| 3. | 200 K | 4. | 110 K |
Subtopic: Spontaneity & Entropy |
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What is the boiling point of the liquid at 1 atm if the enthalpy of vaporization of a liquid is 30 \(\mathrm{kJ} \mathrm{mol}^{-1}\) and entropy of vaporization is 75 \( \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\)?
1. 250 \(K\)
2. 400 \(K\)
3. 450 \(K\)
4. 600 \(K\)
1. 250 \(K\)
2. 400 \(K\)
3. 450 \(K\)
4. 600 \(K\)
Subtopic: Spontaneity & Entropy |
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Match the process name given in column I with the corresponding data in column II and mark the appropriate option.
1. (A) →(ii), (B)→(iii), (C) →(i), (D)→ (iv)
2. (A) →(iv), (B)→(i), (C) →(iii), (D)→ (ii)
3. (A) →(i), (B)→(ii), (C) →(iv), (D)→ (iii)
4. (A) →(iii), (B)→(iv), (C) →(i), (D)→ (ii)
| Column I | Column II | ||
| (A) | Exothermic | (i) | \(\Delta H= 0 , \Delta U =0\) |
| (B) | Spontaneous | (ii) | \(\Delta G=0~\) |
| (C) | Cyclic process | (iii) | \(\Delta H\) is negative |
| (D) | Equilibrium | (iv) | \(\Delta G\) is negative |
1. (A) →(ii), (B)→(iii), (C) →(i), (D)→ (iv)
2. (A) →(iv), (B)→(i), (C) →(iii), (D)→ (ii)
3. (A) →(i), (B)→(ii), (C) →(iv), (D)→ (iii)
4. (A) →(iii), (B)→(iv), (C) →(i), (D)→ (ii)
Subtopic: Thermodynamics' Properties and process | Spontaneity & Entropy |
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Among the following, the reaction that is accompanied by a decrease in the entropy is:
| 1. | \(N_2(g)+3H_2(g)~\longrightarrow~2NH_3(g)\) |
| 2. | \(C_6H_{12}O_6(s)+6O_2(g)~\longrightarrow~6CO_2(g)+6H_2O(l) \) |
| 3. | \(PCl_5(s)~\longrightarrow~PCl_3(l)+Cl_2(g) \) |
| 4. | \(2H_2O(l)~\longrightarrow~2H_2(g)+O_2(g) \) |
Subtopic: Spontaneity & Entropy |
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In which of the following process, entropy change (∆S) is negative?
1. Hg(l) → Hg(g)
2. Cgraphite → Cdiamond
3. AgNO3(s) → AgNO3(aq)
4. l2(s) \(\xrightarrow[]{\Delta }\) l2(g)
Subtopic: Spontaneity & Entropy |
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Subtopic: Spontaneity & Entropy |
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AIPMT - 2002
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The reaction, among the following, that has ∆S° > 0 is:
| 1. | S8(l) → S8(s, monoclinic) |
| 2. | H2(g) + O2(g) → H2O2(aq) |
| 3. | H2(g) + 2 Ag+(aq) → 2 H+(aq) + 2 Ag(s) |
| 4. | PCl5(g) → PCl3(g) + Cl2(g) |
Subtopic: Spontaneity & Entropy |
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Which of the following processes would have a negative \(\Delta\)S?
| 1. | The evaporation of a liquid. |
| 2. | The freezing of a liquid. |
| 3. | The melting of a solid. |
| 4. | The sublimation of a solid. |
Subtopic: Spontaneity & Entropy |
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