Q.

Statement I: Enthalpy of graphite is lower than that of diamond.Statement II : Entropy of graphite is greater than that of diamond.

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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) Graphite is the standard state for carbon hence enthalpy of graphite(zero)  is Lower than that of diamond(II) Graphite has layer lattice structure which is less compact more random than the structure of diamondHence entropy of graphite is greater than that of diamond
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Statement I: Enthalpy of graphite is lower than that of diamond.Statement II : Entropy of graphite is greater than that of diamond.