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Q.

Assertion (A) : Standard enthalpy of graphite is zero.
Reason (R) : Standard enthalpy of every crystalline allotrope of carbon is zero.

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a

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

b

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

c

A is true, R is false

d

Both (A) and (R) are false

answer is C.

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Detailed Solution

graphite is thermodynamically most stable form under standard conditions its enthalpy is zero

all crystalline allotropes of carbon are not thermodynamically stable hence enthalpy of formation is not zero

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Assertion (A) : Standard enthalpy of graphite is zero.Reason (R) : Standard enthalpy of every crystalline allotrope of carbon is zero.