The heats of neutralisation of four acids A, B, C and D are -13.7, -9.4, -11.2 and -12.4 kcal respectively when they are neutralised by a common base. The acidic character obeys the order :

1. A>B>C>D

2. A>D>C>B

3. D>C>B>A

4. D>B>C>A

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The Hf for CO2(g), CO(g) and H2O(g) are -393.5, -110.5 and -241.8 kJ mol-1 respectively. The standard enthalpy change (in kJ) for the reaction,

CO2g+H2gH2Og is :

1. 524.21

2. 41.2

3. -262.5

4. -41.2

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The dissociation energy of CH4 and C2H6 are respectively 360 and 620 Kcal/mole. The bond energy of C-C is-

1. 260 Kcal/mole

2. 180 Kcal/mole

3. 130 Kcal/mole

4. 80 Kcal/mole

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Thermochemistry
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For an endothermic reaction-

1. ProductsH=ReactantsH

2. ProductsH<ReactantsH

3. ProductsH>ReactantsH

4. ProductsH=0 but ReactantsH is positive.

Concept Questions :-

Enthalpy and It's Type
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All the natural process in this universe produce

1. A decrease in entropy of the universe

2. An increase in entropy of the universe

3. No change in entropy

4. Sometimes increase or sometimes decrease in entropy

Concept Questions :-

Spontaneity and Entropy
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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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