Q.

(A) : Standard Enthalpy of formation of graphite is zero but of diamond is not zero
( R) : Standard Enthalpy of formation of thermodynamically stable  allotrope is taken as zero
 

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a

Both A and R are true and R is the correct explanation of A

b

A is false but R is true

c

Both A and R are true and R is not the correct explanation of A

d

A is true but R is false

answer is A.

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Detailed Solution

Graphite is most stable form hence its enthalpy is zero 

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(A) : Standard Enthalpy of formation of graphite is zero but of diamond is not zero( R) : Standard Enthalpy of formation of thermodynamically stable  allotrope is taken as zero