An ideal gas expands isothermally from 10-3m3 to 10-2 m3 at 300 K against a constant pressure of 105 Nm-2. The work done by  the gas is:

1. +270 kJ 2. –900 J
3. +900 kJ 4. –900 kJ

Subtopic:  First Law of Thermodynamics |
 70%
From NCERT
NEET - 2019
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Reversible expansion of an ideal gas under isothermal and adiabatic conditions are as shown in the figure:

 

ABIsothermal expansion

ACAdiabatic expansion

Which of the following options is not correct?

1. Sisothermal>Sadiabatic

2. TA=TB

3. Wisothermal>Wadiabatic

4. TC>TA

Subtopic:  2nd & 3rd Law of Thermodynamics |
 53%
From NCERT
NEET - 2019
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Given, the following reaction:

N2H4(g)          N2H2(g)+H2(g);
Given:  ∆ H= 109 kJ/mol

B.E. of (N-N) = 163 kJ/mol

B.E. of (N-H) = 391 kJ/mol

B.E. of (H-H) = 436 kJ/mol

Calculate the bond enthalpy of N = N.

1. 182 kJ/mol

2. 400 kJ/mol

3. 300 kJ/mol

4. 218 kJ/mol

Subtopic:  Thermochemistry |
 72%
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The pair of isochoric among the transformation of state is:

1. K to L and L to M

2. L to M and N to K

3. L to M and M to N

4. M to N and N to K

Subtopic:  Classification of System, Extensive & Intensive Properties |
 89%
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Consider the following reactions: 

(i) H+(aq) + OH-(aq) → H2O(l)
ΔH = -x1 kJmol-1
(ii) H2(g) + 1/2O2(g) → H2O(l)
ΔH = -x2 kJmol-1
(iii) CO2(g) + H2(g) → CO (g) + H2O(l)
ΔH = -x3 kJmol-1
(iv) C2H2(g) + 5/2O2(g) →  2CO+ H2O(l)
ΔH = -x4 kJmol-1


Enthalpy of formation of H2O(l) is :

1. -x3 kJ mol-1

2. -x4 kJ mol-1

3. -x1 kJ mol-1

4. -x2 kJ mol-1

Subtopic:  Thermochemistry |
 75%
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AIPMT - 2007
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The heat of combustion of carbon to CO2 is –393.5 KJ/mol. The heat changed upon the formation of 35.2 g of CO2 from carbon and oxygen gas is:
1. –315 KJ
2. +315 KJ
3. –630 KJ
4. +630 KJ

Subtopic:  Thermochemistry |
 73%
From NCERT
NEET - 2015
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Following reaction occurs at 25C :

2NO(g) , (1 × 10-5   atm) + Cl2(g), ( 1×10-2 atm) ⇌ 2NOCl(g), ( 1×10- 2 atm) ∆Go   is-

1. -45.65 kJ

2. -28.53 kJ

3. -22.82 kJ

4. -57.06 kJ

Subtopic:  Gibbs Energy Change |
 62%
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When 1 g H2 gas at S.T.P is expanded to twice its initial volume, then the work done is:

1. 22.4 L atm
2. 5.6 L atm
3. 11.2 L atm
4. 44.8 L atm

Subtopic:  First Law of Thermodynamics |
 55%
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Thermodynamics is not concerned about:

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 |
 71%
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The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0 °C is:

1. 10.52 cal/(mol K)

2. 21.04 cal/(mol K)

3. 5.260 cal/(mol K)

4. 0.526 cal/(mol K)

Subtopic:  Enthalpy & Internal energy |
 80%
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NEET - 2012
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