Assertion (A): The enthalpy of formation of $H_{2} O_{(l)}$ is greater than that of $H_{2} O (g)$
Reason (R): Enthalpy change is negative for the condensation reaction $H_{2} O (g) \to H_{2} O (l)$

Both assertion and reason are correct, reason is the correct explanation of the assertion

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Both assertion and reason are correct reason is the not correct explanation of the assertion

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Assertion is correct, reason is incorrect

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Assertion is incorrect , reason is correct

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Solution

The correct option is B Both assertion and reason are correct, reason is the correct explanation of the assertion
Difference between the heat of reaction of liquid water and condensation is the heat of condensation reaction which is negative.
Hence standard heat of formation is more negative for liquid water than steam.
Note standard heat of formation are always compared in negative values.

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Similar questions

Q. Assertion :The enthalpy of formation of

H_{2} O (l)

is greater than that of

H_{2} O (g)

. Reason: Enthalpy change is negative for the condensation reaction

H_{2} O (g) ⟶ H_{2} O (l)

Q. Assertion :The enthalpy of formation of

H_{2} O (l)

is greater than that of

H_{2} O (g)

Reason: Enthalpy change is negative for the condensation reaction:

H_{2} O (g) ⟶ H_{2} O (l)

Assertion (A) The enthalpy of reaction remains constant in the presence of a catalyst.

Reason (R) A catalyst participating in the reaction forms different activated complex and lowers down the activation energy but the difference in enrgy of reactant and product remains the same.

(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) 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.

Assertion (A) p-nitrophenol is more acidic than phenol.
Reason (R) Nitro group helps in the stabilisation of the phenoxide ion by dispersal of negative charge due to resonance.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion (A): The enthalpy of formation of H2O(l)is greater than that of H2O(g) Reason (R): Enthalpy change is negative for the condensation reaction H2O(g)→H2O(l)

Assertion (A): The enthalpy of formation of $H_{2} O_{(l)}$ is greater than that of $H_{2} O (g)$
Reason (R): Enthalpy change is negative for the condensation reaction $H_{2} O (g) \to H_{2} O (l)$