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

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

651.

The relation between H and E is :

  • E = H + nRT

  • H = E - nRT

  • H = E + nRT

  • E = H + nRT


652.

In which of the following process , maximum increase in entropy is observed ?

  • Melting of ice

  • Sublimation of naphthalene

  • Condensation of water

  • Dissolution of salt in water


653.

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


654.

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


Advertisement
655.

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)


Advertisement

656.

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


C.

both acid and base are strong

Heat of neutralisation for strong acid and strong base is always close to 13.7 kcal .

HAstrong acid + BOHstrong base  H2O + AB

H = - 13.7 Kcal

The heat of neutralisation of strong acid and strong base is actually the heat of formation of 1 gmole of water from 1 g of H+ and 1 g of OH- .


Advertisement
657.

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


658.

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


Advertisement
659.

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


660.

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

  • -42 kJ

  • -88 kJ

  • +88 kJ

  • +42 kJ


Advertisement