Assertion :The enthalpy of both graphite and diamond is taken to be zero, being elementry substances. Reason: The enthalpy of formation of an elementary substance in any state is taken as zero.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
The enthalpy of graphite is taken to be zero, being elementary substance. For diamond, the standard enthalpy of formation is 1.9 kJ/mol.
The enthalpy of formation of an elementary substance in the standard state is taken as zero.

Hence, both assertion and reason are incorrect.

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Similar questions

Q. Assertion :The enthalpy of both graphite and diamond is taken to be zero, being elementary substances. Reason: The enthalpy of formation of an elementary substance in any state is taken as zero.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Order and molecularity are same.

Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

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