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

Subtopic:  Enthalpy & Internal energy |
 68%
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The correct calculate value for H for:

M(s) M2+(aq)

From following arbitrary values : 

M(s) M(g) ;H = 1000KJ mol-1
M(g) M+(g) ; H = 750KJ mol-1
M+(g)M2+(g);H = 1200KJ mol-1
M2+(g)+aq M2+(aq.); H = -1800KJ mol-1

1. 1950 KJ mol-1 

2. 1150 KJ mol-1 

3. 2300 KJ mol-1 

4. None of the above.

Subtopic:  Enthalpy & Internal energy |
 77%
From NCERT
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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

Subtopic:  Enthalpy & Internal energy |
 69%
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The lattice energy of NaCl is 780 kJ mol-1. The enthalpy of hydration of Na+(g) and Cl-(g) ions are -406 kJ mol-1 and -364 kJ mol-1. The enthalpy of the solution of NaCl(s) is-

1. 23 kJ mol-1

2. 10 kJ mol-1

3. -10 kJ mol-1

4. -82 kJ mol-1

Subtopic:  Enthalpy & Internal energy |
 64%
From NCERT
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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

Subtopic:  Spontaneity & Entropy |
 70%
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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

Subtopic:  Gibbs Energy Change |
 54%
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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

Subtopic:  Spontaneity & Entropy |
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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

Subtopic:  Gibbs Energy Change |
 78%
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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

Subtopic:  Thermochemistry |
 70%
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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

Subtopic:  Cp & Cv |
 63%
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