Consider the reaction

N2(g) + 3H2(g)2NH3(g) carried out at constant temperature and pressure. If H and E are enthalpy change and internal energy change respectively, which of the following expression is True?

1.  HE                        2. H=E3.  H<E                       4. H>E

Subtopic:  Enthalpy & Internal energy |
 68%
From NCERT
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Work done is maximum in -

1. Isobaric work           

2. Isothermal work

3. Isochoric work         

4. Adiabatic work

Subtopic:  Thermodynamics' Properties and process |
 54%
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Hints

For exothermic reaction to be spontaneous (S=negative) temperature must be -

1. High 2. Zero
3. Constant 4. Low
Subtopic:  Spontaneity & Entropy |
 66%
From NCERT
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Which of the following conditions should be satisfied for the given reaction to be spontaneous at 0°C and 1 atm?

H2O(s) H2O(l)

(1) H=G

(2) H<T.S

(3) H>T.S

(4) H=T.S

Subtopic:  Spontaneity & Entropy |
 64%
From NCERT
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'The free energy change due to a reaction is zero when-

1. The reactants are initially mixed.

2.  A catalyst is added

3. The system is at equilibrium

4. The reactants are completely consumed

Subtopic:  Gibbs Energy Change |
 88%
From NCERT
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An ideal gas expands at a constant external pressure of 2.0 atmosphere by 20 litre and absorbs 10kJ of heat from surrounding. What is the change in internal energy of the system:-

(1) 4052 J

(2) 5948 J

(3) 14052 J

(4) 9940 J

Subtopic:  First Law of Thermodynamics |
 52%
From NCERT
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36 ml of pure water takes 100 sec to evaporate from a vessel and heater connected to an electric source which delivers 806 watt. The Hvaporisation of H2O is:-

(1) 40.3 kJ/mol

(2) 43.2 kJ/mol

(3) 4.03 kJ/mol

(4) None of these

 

Subtopic:  First Law of Thermodynamics |
 54%
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5 moles of an ideal gas expands isothermally and irreversibly from a pressure of 10 atm to 1 atm against a constant external pressure of 1 atm. find the Wirr at 300 K:-

1. -15.921 kJ

2. -11.224 kJ

3. -110.83 kJ

4. None of these

Subtopic:  2nd & 3rd Law of Thermodynamics |
 58%
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In the reaction at 300 K

H2(g) + Cl2(g)2HCl(g)       H°= -185 kJ

if 2 mol of H2 completely react with 2 mole of Cl2 to form HCl. What is U° for this reaction?

(1) 0

(2) -185 kJ

(3) -370 kJ

(4) None of these

Subtopic:  Enthalpy & Internal energy |
From NCERT
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Predict which of the following reaction(s) has a positive entropy change?

(i) Ag+ (aq) + Cl-(aq) AgCl(s)

(ii) NH4Cl(g) NH3(g) + HCl(g)

(iii) 2NH3(g)N2(g) + 3H2(g)

(1) i & ii

(2) iii

(3) ii & iii

(4) ii

 

Subtopic:  Spontaneity & Entropy |
 85%
From NCERT
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