For the reaction, 2N2g+O2g2N2O, at 298K H is 164 KJ mol-1. The E of the reaction is

1. 166.5 kJ mol-1

2. 161.5 kJ mol-1

3. 164.0 kJ mol-1

4. 169 kJ mol-1

Concept Questions :-

Enthalpy and It's Type
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For ABH=4 kcal mol-1, S=10 cal mol-1K-1. Reaction is spontaneous when temperature can be :

1. 400 K

2. 300 K

3. 500 K

4. none is correct

Concept Questions :-

Spontaneity and Entropy
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44.0 kJ of heat is required to evaporate one mole of water at 298 K. If Hf of H2Ol is -286 kJ mol-1Hf of H2Og is

1. -330 kJ mol-1

2. +242 kJ mol-1

3. -242 kJ mol-1

4. -198 kJ mol-1

Concept Questions :-

Enthalpy and It's Type
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The molar heat capacity, Cv of an ideal gas whose energy is that of translational motion only is

1.  2.98 J deg-1mol-1

2. 12.47 J deg-1mol-1

3. 6.43 J deg-1mol-1

4. 9.41 J deg-1mol-1

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The lattice energy of NaCl is -780 kJ mol-1. The enthalpies of hydration of Na+(g) and Cl-(g) ions are -406 kJ mol-1 and -364 kJ mol-1. The enthalpy of solution of NaCl(s) is

1. 738 kJ mol-1

2. 10 kJ mol-1

3. -10 kJ mol-1

4. -822 kJ mol-1

Concept Questions :-

Enthalpy and It's Type
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Enthalpy of fusion of a liquid is 1.435 kcal mol-1 and molar entropy change is 5.26 cal mol-1K-1. Hence melting point of liquid is :

1. 100C

2. 0C

3. 373 K

4. -273C

Concept Questions :-

Spontaneity and Entropy
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Following reaction occurs at 25C :

2NOg, 1×10-5atm+Cl2g, 1×10-2atm2NOClg, 1×10-2atmG is-

1. -45.65 kJ

2. -28.53 kJ

3. -22.82 kJ

4. -57.06 kJ

Concept Questions :-

Gibbs Energy Change
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When 1 mole of an ideal gas to 20 atm pressure and 15 L volume expands such that the final pressure becomes 10 atm and the final volume become 60 L. Calculate entropy change for the reaction (Cp.m = 30.96)

1. 80.2 J k-1mol-1

2. 62.42 J k-1mol-1

3. 120×102 J k-1mol-1

4. 27.22 J k-1mol-1

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If a process is both endothermic and spontaneous, then :

1. S>0

2. S<0

3. H<0

4. G>0

Concept Questions :-

Gibbs Energy Change
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The bond energies of C=C and C-C at 298 K are 590 and 331 kJ mol-1 respectively. The enthalpy of polymerization per mole of ethylene is

1. -70 kJ

2. -72 kJ

3. 72 kJ

4. -68 kJ

Concept Questions :-

Thermochemistry
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