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Byju's Answer

Standard XII

Chemistry

Heat of Formation

Assertion :Th...

Question

Assertion :The enthalpy change for the reaction $C a O (s) + C O_{2 (g)} \to C a C O_{3 (s)}$ is called enthalpy of formation of calcium carbonate. Reason: The reaction involves formation of 1 mole of $C a C O_{3}$ from its constituent elements.

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 molar enthalpy of the formation, $Δ H$ , is defined as the enthalpy change when 1 mole of a compound is formed directly from its constituent elements is stable and in standard state.

$C a O (s) + C O_{2 (g)} \to C a C O_{3 (s)}$

Here compounds are involved in formation of $C a C O_{3}$ not elements.

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Similar questions

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: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

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 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.

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Assertion :The enthalpy change for the reaction CaO(s)+CO2(g)→CaCO3(s) is called enthalpy of formation of calcium carbonate. Reason: The reaction involves formation of 1 mole of CaCO3 from its constituent elements.

Assertion :The enthalpy change for the reaction $C a O (s) + C O_{2 (g)} \to C a C O_{3 (s)}$ is called enthalpy of formation of calcium carbonate. Reason: The reaction involves formation of 1 mole of $C a C O_{3}$ from its constituent elements.