Assertion :The enthalpy of formation of gaseous oxygen molecules at $298 K$ and under a pressure of 1 atm is zero. Reason: The entropy of formation of gaseous oxygen molecules under the same condition is 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 C Assertion is correct but Reason is incorrect
$Δ H_{f} = 0$ for formation of gaseous oxygen molecule.
The process is irreversible in nature.
From 2nd law of thermodynamics,
$Δ S >= 0$ equality holds when the process is reversible
Hence, reason is incorrect
So, option C is correct

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Similar questions

Q. Assertion :The enthalpy of formation of gaseous oxygen molecules at

298 K

and under pressure of 1 atm is zero. Reason: The entropy of formation of gaseous oxygen molecules under the same condition is zero.

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.

(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.

Q. Assertion: 100 ml of blood delivers 5 ml oxygen to tissues in normal conditions
Reason : One molecule of Hb can bind with 4 molecules of oxygen

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

Q. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
High biological oxygen demand means low activity of bacteria in water.

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Assertion :The enthalpy of formation of gaseous oxygen molecules at 298K and under a pressure of 1 atm is zero. Reason: The entropy of formation of gaseous oxygen molecules under the same condition is zero.

The correct option is C Assertion is correct but Reason is incorrectΔHf=0 for formation of gaseous oxygen molecule.The process is irreversible in nature.From 2nd law of thermodynamics,ΔS>=0 equality holds when the process is reversibleHence, reason is incorrectSo, option C is correct

Assertion :The enthalpy of formation of gaseous oxygen molecules at $298 K$ and under a pressure of 1 atm is zero. Reason: The entropy of formation of gaseous oxygen molecules under the same condition is zero.