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Q. No.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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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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Level 1: 80%+
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Consider a reaction:
\(A_2 + B_2 \rightarrow 2AB\\ (g)~~~~(g)~~~~~~~~(g) \)
If \(\Delta H^o_f \) of \(A_2 , AB \) and \(B_2\) are in the ratio \(1: {1 \over 2}: 1\) and \(\Delta H \) of the reaction is -200 kJ/mol. The value of \(\Delta H^o_f~ (A_2)\)(kJ mol-1) is:
1. 250
2. 200
3. 300
4. 240
\(A_2 + B_2 \rightarrow 2AB\\ (g)~~~~(g)~~~~~~~~(g) \)
If \(\Delta H^o_f \) of \(A_2 , AB \) and \(B_2\) are in the ratio \(1: {1 \over 2}: 1\) and \(\Delta H \) of the reaction is -200 kJ/mol. The value of \(\Delta H^o_f~ (A_2)\)(kJ mol-1) is:
1. 250
2. 200
3. 300
4. 240
Subtopic: Thermochemistry |
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Level 1: 80%+
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What is the correct relationship between changes in enthalpy and internal energy within the following options?
1. \(\mathrm{\Delta {H}+\Delta {U}=\Delta {nR}} \)
2. \(\mathrm{\Delta {H}=\Delta {U -\Delta n_gRT}}\)
3. \(\mathrm{\Delta {H}=\Delta {U+\Delta n_gRT }}\)
4. \(\mathrm{\Delta {H} -\Delta {U=-\Delta n_gRT}}\)
1. \(\mathrm{\Delta {H}+\Delta {U}=\Delta {nR}} \)
2. \(\mathrm{\Delta {H}=\Delta {U -\Delta n_gRT}}\)
3. \(\mathrm{\Delta {H}=\Delta {U+\Delta n_gRT }}\)
4. \(\mathrm{\Delta {H} -\Delta {U=-\Delta n_gRT}}\)
Subtopic: Enthalpy & Internal energy |
83%
Level 1: 80%+
NEET - 2023
Hints
Consider the following reaction:
\(\mathrm{2H_2(g) + O_2(g) \rightarrow 2H_2O(g); ~\Delta_rH^\circ = -483.64~ kJ }\)
What is the enthalpy change (in KJ) for the decomposition of one mole of water?
\(\mathrm{2H_2(g) + O_2(g) \rightarrow 2H_2O(g); ~\Delta_rH^\circ = -483.64~ kJ }\)
What is the enthalpy change (in KJ) for the decomposition of one mole of water?
| 1. | 120.9 | 2. | 241.82 |
| 3. | 18 | 4. | 100 |
Subtopic: Thermochemistry |
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Level 1: 80%+
NEET - 2023
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A sample of 54.0g of methanol is heated from 25.0°C to 35.0°C. The amount of heat required is: (Given: The specific heat capacity of methanol is 2.48 J g–1 K–1)
| 1. | 0.00459 J | 2. | 0.0747 J |
| 3. | 1340 J | 4. | 4690 J |
Subtopic: Enthalpy & Internal energy |
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Find the final temperature (T₂) of 1 mole of an ideal gas undergoing an adiabatic compression process.
Given:
Cᵥ = 20 J K⁻¹ mol⁻¹
Work done = 3 kJ
T₁ = 27°C
1. 169
2. 184
3. 177
4. 191
Subtopic: Cp & Cv |
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The correct match for the following options is:
1. A → Q, B → P, C → S, D → R
2. A → P, B → Q, C → R, D → S
3. A → S, B → R, C → Q, D → P
4. A → P, B → R, C → S, D → Q
| List-I | List-II | ||
| (A) | Adiabatic | (P) | ∆T = 0 |
| (B) | Isothermal | (Q) | Heat exchange is zero |
| (C) | Isochoric | (R) | ∆P = 0 |
| (D) | Isobaric | (S) | Work done is zero |
1. A → Q, B → P, C → S, D → R
2. A → P, B → Q, C → R, D → S
3. A → S, B → R, C → Q, D → P
4. A → P, B → R, C → S, D → Q
Subtopic: First Law of Thermodynamics |
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If the volume of an ideal gas is increased isothermally then its internal energy will be:
1. Increases
2. Remains constant
3. Decreases
4. Can be increased or decreased
1. Increases
2. Remains constant
3. Decreases
4. Can be increased or decreased
Subtopic: First Law of Thermodynamics |
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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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