In which case of mixing of a strong acid and a base, each of 1(N) concentration, temperature-increase is the highest ?

1. 20 ml acid and 30 ml alkali

2. 10 ml acid and 40 ml alkali

3. 25 ml acid and 25 ml alkali

4. 35 ml acid and 15 ml alkali

Concept Questions :-

Thermochemistry
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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

Concept Questions :-

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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