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Standard XII

Chemistry

Heat of Formation

Assertion :Th...

Question

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:
$H_{2} O (g) ⟶ H_{2} O (l)$ :

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$The enthalpy of formation of liquid water is greater than that of gasious water because enthalpy changes is$ $negative in condensation reaction of gasious water to form liquid water.$

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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 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): 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 $H_{2} O (g) \to H_{2} O (l)$

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.

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 H2O(l) is greater than that of H2O(g) Reason: Enthalpy change is negative for the condensation reaction:H2O(g)⟶H2O(l):

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for AssertionThe enthalpy of formation of liquid water is greater than that of gasious water because enthalpy changes is negative in condensation reaction of gasious water to form liquid water.

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:
$H_{2} O (g) ⟶ H_{2} O (l)$ :

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$The enthalpy of formation of liquid water is greater than that of gasious water because enthalpy changes is$ $negative in condensation reaction of gasious water to form liquid water.$