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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1 mole of NH3 gas at 27C is expanded adaibatic condition to make volume 8 times (γ=1.33). Final temperature and work done respectively are-

1. 150 K, 900 cal

2. 150 K, 400 cal

3. 250 K, 1000 cal

4. 200 K, 800 cal

Concept Questions :-

CP and CV and Relation for Real Gas
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Which of the following statements is correct with regard to G of a cell reaction and EMF of the cell (E) in which the reaction occurs ?

(A) Both G and E are extensive properties

(B) G is an intensive property but E is an extensive property

(C) G is an extensive property and E is an intensive property

(D) Both G and E are intensive properties.

Concept Questions :-

Extensive and Intensive Properties
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Temperature of 1 mol of a gas is increased by 1 at constant pressure. Work done is-

1. R

2. 2R

3. R/2

4. 3R

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When 0.16 g of glucose was burnt in a bomb calorimeter, the temperature rose by 4 deg. Calculate the calorimeter constant (water equivalent of the calorimeter) given that H=-2.8×106 J mol-1. [molar enthalpy of combustion]. Molar mass of glucose = 180 mol-1.

1. 5.73×102 J/deg

2. 7.53×102 J/deg

3. 6.22×102 J/deg

4. 3.57×102 J/deg

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