For the reaction of one mole of zinc dust with one mole of sulphu

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 Multiple Choice QuestionsMultiple Choice Questions

321.

The heat of formation of C12H22O11 (s) , CO2 (g) and (H2O) are - 530 , -94.3 and- 68.3 kcalmol-1 respectively. The amount of C12H22O11 to supply 2700 kcal of energy is :

  • 382.70 g

  • 832.74 g

  • 463.9 g

  • 684.0 g


322.

Spontaneous adsorption of gas on solid surface is an exothermic process because :

  • ΔH increases for system

  • ΔS increases for gas

  • ΔS decreases for gas

  • ΔG increases for gas


323.

Fermentation is :

  • reversible

  • exothermic

  • endothermic

  • None of these


324.

Assertion : A reaction which is spontaneous and accompanied by decrease of randomness must be exothermic.

Reason : All exothermic reactions are accompanied by decrease of randomness.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


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325.

For the complete combustion of 4 L ethane , how much oxygen is required ?

  • 14 L

  • 4 L

  • 8 L

  • 12 L


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326.

For the reaction of one mole of zinc dust with one mole of sulphuric acid in a bomb calorimeter, U and w correspond to

  • U < 0, w = 0

  • U < 0, w < 0

  • U > 0, w = 0

  • U > 0, w > 0


A.

U < 0, w = 0

Bomb calorimeter commonly used to find the heat of combustion of organic substances, consists of a sealed combustion chamber, called a bomb.

The reaction in a bomb calorimeter proceeds at constant volume so, w = 0 and U = q.

Hence, U < 0, w = 0


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327.

One mole of which of the following has the highest entropy ?

  • Liquid nitrogen

  • Hydrogen gas

  • Mercury

  • Diamond


328.

1 mole of H2SO4 is mixed with 2 moles of NaOH .The heat evolved will be :

  • 57.3 kJ

  • 2 x 57.3 kJ

  • 57.3/2 kJ

  • Cannot be predicted


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329.

One mole. of a perfect gas expands isothermally to ten times of its original volume. The change in entropy is :

  • 0.1 R

  • 2.303 R

  • 10.0 R

  • 100.0 R


330.

For the reaction :

N2 + 3H2  2NH3H = ?

  • E + 2RT

  • E - 2RT

  • E + RT

  • E - RT


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