Assertion :Enthalpy and entropy of any elementary substance in their standard states are taken as zero.
Because Reason: At absolute zero, particles of the perfectly crystalline substance become completely ordered.

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

As we know,
for all elements and compounds in their most stable and perfect crystalline state at absolute zero and one atmosphere pressure, entropy is zero.
Also,
enthalpy of formation for an element in its standard state is zero.

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Similar questions

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.

(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 of the reaction can be zero or fractional.

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

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 – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Q. ASSERTION:

Δ_{f} H^{o}

for white phosphorus has been taken to be zero, whereas black phosphorus is the most stable allotrope of phosphorus and this is the only exception.

REASON:
The reference standard state of white phosphorus is taken despite the fact that this form is not the most stable allotrope but simply the most reproducible form of phosphorus.

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Assertion :Enthalpy and entropy of any elementary substance in their standard states are taken as zero. Because Reason: At absolute zero, particles of the perfectly crystalline substance become completely ordered.

The correct option is D Both Assertion and Reason are incorrectAs we know,for all elements and compounds in their most stable and perfect crystalline state at absolute zero and one atmosphere pressure, entropy is zero.Also,enthalpy of formation for an element in its standard state is zero.

Assertion :Enthalpy and entropy of any elementary substance in their standard states are taken as zero.
Because Reason: At absolute zero, particles of the perfectly crystalline substance become completely ordered.

The correct option is D
Both Assertion and Reason are incorrect

As we know,
for all elements and compounds in their most stable and perfect crystalline state at absolute zero and one atmosphere pressure, entropy is zero.
Also,
enthalpy of formation for an element in its standard state is zero.