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

Subtopic:  Hess's Law |
 90%
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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+ CO(g) is :

1. 524.21

2. 41.2

3. -262.5

4. -41.2

Subtopic:  Hess's Law |
 70%
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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

Subtopic:  Thermochemistry |
 67%
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For an endothermic reaction-

1. ProductsH=ReactantsH

2. ProductsH<ReactantsH

3. ProductsH>ReactantsH

4. ProductsH=0 but ReactantsH is positive.

Subtopic:  Enthalpy & Internal energy |
 71%
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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

Subtopic:  Spontaneity & Entropy |
 77%
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For the reaction, 2N2g+O2g2N2O(g), at 298K H is 164 kJ mol-1. The E of the reaction is-
1. \(166.5 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
2. \(141.5 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
3. \(104.0 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
4. \(-169 \mathrm{~kJ} \mathrm{~mol}^{-1}\)

Subtopic:  Enthalpy & Internal energy |
 73%
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For \(A \rightarrow B\)\(\Delta H = 4\ kcal\ mol^{-1}\)\(​​\Delta S = 10\ cal\ mol^{-1}\ K^{-1}\), the reaction is spontaneous when the temperature is:
1. 400 K
2. 300 K
3. 500 K
4. None of the above

Subtopic:  Spontaneity & Entropy |
 56%
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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

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%
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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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