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Q. No.Given the standard enthalpies of the gas-phase reactions of hydrogen sulphide, what is the standard enthalpy of reaction for the gas-phase combustion of carbon disulphide?
Reaction
Δ Hºrxn, kJ mol–1
H2S + 1.5O2 → SO2 + H2O
–518.2
2H2S + CO2 → CS2 + 2H2O
67.8
CS2 + 3O2 → CO2 + 2SO2
???
1. –450.4 kJ mol–1
2. –586.0 kJ mol–1
3. –968.6 kJ mol–1
4. –1104.2 kJ mol–1
Subtopic: Hess's Law |
74%
Level 2: 60%+
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Burning 48.0 g of graphite in excess oxygen under standard conditions releases 1574.0 kJ of heat. What is \(\Delta H_f^{\circ}\) of CO2(g)?
1. 157 kJ mol-1
2. –1574 kJ mol-1
3. –394 kJ mol-1
4. 32.8 kJ mol-1
1. 157 kJ mol-1
2. –1574 kJ mol-1
3. –394 kJ mol-1
4. 32.8 kJ mol-1
Subtopic: Thermochemistry |
71%
Level 2: 60%+
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Which reaction has ΔH∘reaction equal to the \(\Delta H_f^{\circ}\) of CaSO3(s)?
1. Ca(s) + \(\frac{1}{8}\) S8(s, rhombic) + \(\frac{3}{2}\) O2(g) → CaSO3(s)
2. 8Ca(s) + S8(s) + 12O2(g) → 8CaSO3(s)
3. 8Ca(s) + S8(g) + 12O2(g) → 8CaSO3(s)
4. CaO(s) + SO2(g) → CaSO3(s)
1. Ca(s) + \(\frac{1}{8}\) S8(s, rhombic) + \(\frac{3}{2}\) O2(g) → CaSO3(s)
2. 8Ca(s) + S8(s) + 12O2(g) → 8CaSO3(s)
3. 8Ca(s) + S8(g) + 12O2(g) → 8CaSO3(s)
4. CaO(s) + SO2(g) → CaSO3(s)
Subtopic: Thermochemistry |
79%
Level 2: 60%+
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Given below are two statements:
| Assertion (A): | Variables like P, V, and T are called state functions. |
| Reason (R): |
Their values depend solely on the system's state, and not on how it is reached. |
| 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: Thermodynamics' Properties and process |
85%
Level 1: 80%+
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Given below are two statements:
| Assertion (A): | Pressure is an intensive property. |
| Reason (R): | Volume 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 |
81%
Level 1: 80%+
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For the given cycle, the work done during the isobaric process is:
| 1. | \(200\) J | 2. | zero |
| 3. | \(400\) J | 4. | \(600\) J |
Subtopic: Work Done by a Gas |
57%
Level 3: 35%-60%
NEET - 2023
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Which of the following relations does not give the equation of an adiabatic process, where terms have their usual meaning?
1. \({P}^{1-\gamma}{T}^{\gamma}= \text{constant}\)
2. \({PV}^{\gamma}=\text{constant}\)
3. \({TV}^{\gamma-1}= \text{constant}\)
4. \({P}^{\gamma} {T}^{1-\gamma}=\text{constant}\)
1. \({P}^{1-\gamma}{T}^{\gamma}= \text{constant}\)
2. \({PV}^{\gamma}=\text{constant}\)
3. \({TV}^{\gamma-1}= \text{constant}\)
4. \({P}^{\gamma} {T}^{1-\gamma}=\text{constant}\)
Subtopic: Types of Processes |
76%
Level 2: 60%+
NEET - 2013
Hints
A system is taken from state \(a\) to state \(c\) by two paths \(adc\) and \(abc\) as shown in the figure. The internal energy at \(a\) is \({U}_{a}=10~\text{J}.\) Along the path \(adc\) the amount of heat absorbed \(\delta Q_1=50~\text{J}\) and the work obtained \(\delta W_1=20~\text{J}\) whereas along the path \(abc\) the heat absorbed \(\delta Q_2 = 36~\text{J}.\) The amount of work along the path \(abc\) is:
| 1. | \(10~\text{J}\) | 2. | \(12~\text{J}\) |
| 3. | \(36~\text{J}\) | 4. | \(6~\text{J}\) |
Subtopic: First Law of Thermodynamics |
79%
Level 2: 60%+
NEET - 2013
Hints
1 mol of monoatomic ideal gas expanded adiabatically against a constant pressure of 2 atm from 10L to 20L. The correct option for the above process is:
1. q = 20 L-atm
2. \(\Delta U = 0 \)
3. \(\Delta U = -20 ~\text L~\text {atm} \)
4. \(\text w = 10 ~\text L~ \text {atm} \)
1. q = 20 L-atm
2. \(\Delta U = 0 \)
3. \(\Delta U = -20 ~\text L~\text {atm} \)
4. \(\text w = 10 ~\text L~ \text {atm} \)
Subtopic: First Law of Thermodynamics |
82%
Level 1: 80%+
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| Statement I: | ∆S total i.e., ∆Ssys + ∆Ssurr is zero for the irreversible process. |
| Statement II: | Total entropy change for the system and surrounding of a spontaneous process is zero. |
| 1. | Statement I is False but Statement II is True. |
| 2. | Both Statement I and Statement II are True. |
| 3. | Both Statement I and Statement II are False. |
| 4. | Statement I is True but Statement II is False. |
Subtopic: Spontaneity & Entropy |
54%
Level 3: 35%-60%
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