The enthalpy change (∆H) for the neutralisation of M H

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 Multiple Choice QuestionsMultiple Choice Questions

351.

For a reaction to be spontaneous at all temperatures ,

  • G and H till should be negative

  • G and H till should be positive

  • G = S = 0

  • H < G


352.

The heat of formarion of CO2 is - 393 kJ mol-1 .The amount of heat evolved in the formation of 0.156 kg of CO2 .

  • - 1393 kJ

  • + 1165.5 kJ

  • + 1275.9 kJ

  • - 1165.5 kJ


353.

In an isobaric process, when temperature changes from T1 to T2 ,S is equal to

  • 2.303 Cp log (T2/T1)

  • 2.303 Cp ln (T2/T1)

  • Cp ln (T1/T2)

  • Cv ln (T2/T1)


354.

Heat of neutralisation of an acid with a base is 13. 7 kcal when :

  • both acid and base are weak

  • acid is weak and base is strong

  • both acid and base are strong

  • acid is strong and base is weak


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355.

Hess's law is based on :

  • law of conservation of mass

  • law of conservation of energy

  • enthalpy is a state function

  • none of the above


356.

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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357.

The enthalpy change (H) for the neutralisation of M HCl by caustic potash in dilute solution at 298 K is :

  • 68 kJ

  • 65 kJ

  • 57.3 kJ

  • 50 kJ


C.

57.3 kJ

HCl(strong acid) + KOH(strong base) neutralisation KCl + H2O

In this reaction , HCl is the strong acid and KOH is the base and it has been found that the heat of neutralisation of a strong acid with a strong base is always constant i.e. , 57.3 kJ .


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358.

Calculate change in internal energy if H = - 92.2 kJ, P = 40 atm and V = -1L.

  • -42 kJ

  • -88 kJ

  • +88 kJ

  • +42 kJ


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359.

Hfusion of a substance is 'x' and Hvap is 'y', then Hsublimation will be

  • x + y

  • x - y

  • x/y

  • y/x


360.

Assertion : Many endothermic reactions that are not spontaneous at room temperature become spontaneous at high temperature.

Reason : Entropy of the system increases with increase in temperature.

  • 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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