For $A\to B$ 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 $∆{H}_{f}$ of ${H}_{2}O\left(l\right)$ is -286 kJ mol-1$∆{{H}^{\circ }}_{f}$ of ${H}_{2}O\left(g\right)$ 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, ${C}_{v}$ of an ideal gas whose energy is that of translational motion only is

1.

2.

3.

4.

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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. ${100}^{\circ }C$

2. ${0}^{\circ }C$

3. 373 K

4. $-{273}^{\circ }C$

Concept Questions :-

Spontaneity and Entropy
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Following reaction occurs at ${25}^{\circ }C$ :

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.

2.

3.

4.

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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 ${27}^{\circ }C$ is expanded adaibatic condition to make volume 8 times ($\gamma$=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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Difficulty Level: