# Choose the correct statement for the work done in the expansion and heat absorbed or released when 5 liters of an ideal gas at 10 atmospheric pressure isothermally expands into a vacuum until the volume is 15 liters: 1. Both the heat and work done will be greater than zero. 2. Heat absorbed will be less than zero and work done will be positive. 3. Work done will be zero and heat will also be zero. 4. Work done will be greater than zero and heat will remain zero.

Subtopic:  First Law of Thermodynamics |
64%
From NCERT
NEET - 2024
Hints

For an endothermic reaction:
A. $$q_p$$ is negative.
B. $$\Delta _r H$$ is positive.
C. $$\Delta _r H$$ is negative.
D. $$q_p$$ is positive.
Choose the correct answer from the options given below:
1. B and D
2. C and D
3. A and B
4. A and C
Subtopic:  Thermodynamics' Properties and process |
68%
From NCERT
NEET - 2024
Hints

For the following reaction at 300K
$$\mathrm{A}_2(\mathrm{~g})+3 \mathrm{~B}_2(\mathrm{~g}) \rightarrow 2 \mathrm{AB}_3(\mathrm{~g})$$
the enthalpy change is +15 kJ, then the internal energy change is:

1. 19.98 K J
2. 200 J
3. 1999 J
4. 1.9988 kJ
Subtopic:  Enthalpy & Internal energy |
74%
From NCERT
NEET - 2024
Hints

Enthalpy of combustion of carbon to carbon dioxide is $$-390.0~\text{kJ mol}^{-1}.$$ The amount of heat released when $$35.0~\text{g}$$ of $$\mathrm{CO_2}$$ is formed from the reaction of carbon and dioxygen gas, is:

1. $$310~\text{kJ}$$
2. $$490~\text{kJ}$$
3. $$245~\text{kJ}$$
4. $$700~\text{kJ}$$
Subtopic:  Enthalpy & Internal energy |
75%
From NCERT
NEET - 2024
Hints

Match List-I with List-II:
 List-I (Process/Property) List-II (Characteristic) A. Adiabatic process I. Independent of amount of substance B. Reversible process II. Both way process reactant to product and vice-versa C. Intensive property III. No transfer of heat between system and surrounding D. Extensive property IV. Dependent on amount of substance
Choose the correct answer from the options given below:
1. A-II, B-III, C-IV, D-I
2. A-I, B-II, C-IV, D-III
3. A-III, B-II, C-I, D-IV
4. A-I, B-II, C-III, D-IV
Subtopic:  Classification of System, Extensive & Intensive Properties |
91%
NEET - 2024
Hints

The standard enthalpy of neutralization is $$-57.3 \mathrm{~K}{\mathrm{J}}~ \mathrm{mol}^{-1}$$as:
$$\small{\underset{\text{strong acid}}{\mathrm{HCl_{(aq)}}}+\underset{\text{strong base}}{\mathrm{NaOH_{(aq)}}}\rightarrow\mathrm{NaCl_{(aq)}+H_2O(l),\Delta H=-57.3~KJ mol^{-1}}}$$
The enthalpy of neutralization of $$0.25 \mathrm{~mol}$$ of HCI by $$0.25 \mathrm{~mol}$$ of $$\mathrm{NaOH}$$ is :

1. $$-57.3~ \mathrm{kJ} ~\mathrm{mol}^{-1}$$
2. $$-28.3 \mathrm{~kJ} \mathrm{~mol}^{-1}$$
3. $$-14.32 \mathrm{~kJ} \mathrm{~mol}^{-1}$$
4. $$+57.3~ \mathrm{kJ}~ \mathrm{mol}^{-1}$$
Subtopic:  Thermochemistry |
60%
NEET - 2024
Hints

The work done during reversible isothermal expansion of one mole of hydrogen gas at 25°C from pressure of 20 atmosphere to 10 atmosphere is :
( Given R = 2.0 cal K-1 mol-1)

1. -413.14 calories
2. 413.14 calories
3. 100 calories
4. 0 calorie

Subtopic:  First Law of Thermodynamics |
67%
From NCERT
NEET - 2024
Hints

In which of the following processes entropy increases?
 A. A liquid evaporates to vapour. B. Temperature of a crystalline solid lowered from $$130~\text{K}$$ to $$0~\text{K}.$$ C. $$2 \mathrm{NaHCO}_{3(\mathrm{~s})} \rightarrow \mathrm{Na}_2 \mathrm{CO}_{3(\mathrm{~s})}+\mathrm{CO}_{2(\mathrm{~g})}+\mathrm{H}_2 \mathrm{O}_{(\mathrm{g})}$$ D. $$\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{Cl}_{(\mathrm{g})}$$
Choose the correct answer from the options given below :
 1 $$\text { A, B and D }$$ 2 $$\text { A, C and D }$$ 3 $$\text { C and D }$$ 4 $$\text { A and C }$$
Subtopic:  Spontaneity & Entropy |
71%
From NCERT
NEET - 2024
Hints

Match List I with List II.
 List I List II (Process) (Conditions) A. Isothermal process I. No heat exchange B. Isochoric process II. Carried out at constant temperature C. Isobaric process III. Carried out at constant volume D. Adiabatic process IV. Carried out at constant pressure
Choose the correct answer from the options given below :
1. $$\text { A-IV, B-II, C-III, D-I }$$
2. $$\text { A-I, B-II, C-III, D-IV }$$
3. $$\text { A-II, B-III, C-IV, D-I }$$
4. $$\text { A-IV, B-III, C-II, D-I }$$
Subtopic:  Thermodynamics' Properties and process |
83%
From NCERT
NEET - 2024
Hints
$$\mathrm{2H_2(g) + O_2(g) \rightarrow 2H_2O(g) \Delta_rH^\circ = -483.64 kJ. }$$