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Q.

Statement I: The enthalpy of formation of H2O(l) is greater than that of H2O(g).Statement II: Enthalpy change is negative for the condensation reaction H2O(g) → H2O(l).

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a

Statement I and Statement II are true.

b

Statement I is true and  statement II is false.

c

Statement I is false and Statement II is true.

d

Statement I and Statement II are false.

answer is A.

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Detailed Solution

(I) some amount of energy is used in the vapourization H2O(l) (II)  Molecules of gas are having high Kinetic energy, high disorder and weak attractive forces    on condensation , K.E decreases , randomness decreases , attractive forces becomes stronger energy is released
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Statement I: The enthalpy of formation of H2O(l) is greater than that of H2O(g).Statement II: Enthalpy change is negative for the condensation reaction H2O(g) → H2O(l).