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Standard XII

Chemistry

Heat of Reaction

Assertion :Re...

Question

Assertion :Reaction quotient is defined in the same way as equilibrium constant at any stage of the reaction. Reason: If $Q_{c}$ (reaction quotient) $< K_{c}$ (equilibrium constant reaction moves in direction of reactants).

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
$a A + b B ⇌ c C + d D$ , $Q_{c} = \frac{{[C]}^{c} {[D]}^{d}}{{[A]}^{a} {[B]}^{b}}$

If $Q_{c} > K_{c}$ , reason will proceed in the direction of reactants
If $Q_{c} < K_{c}$ , reaction will move in direction of products.
If $Q_{c} = K_{c}$ , the reaction mixture is already at equilibrium.

Hence, option C is correct

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Similar questions

Q. Assertion :Assertion : If reaction quotient,

Q_{c}

for a particular reaction is greater than

K_{c}

the reaction will proceed in the direction of reactants. Reason: Reason : Reaction quotient is defined in the same way as the equilibrium constant

K_{c}

except that the concentrations in

Q_{c}

are not necessarily equilibrium values.

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) 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 (A) Ethanol is a weaker acid than phenol.
Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
(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 :Reaction quotient is defined in the same way as equilibrium constant at any stage of the reaction. Reason: If Qc (reaction quotient) <Kc (equilibrium constant reaction moves in direction of reactants).

The correct option is C Assertion is correct but Reason is incorrectaA+bB⇌cC+dD, Qc=[C]c[D]d[A]a[B]bIf Qc>Kc, reason will proceed in the direction of reactantsIf Qc<Kc, reaction will move in direction of products.If Qc=Kc, the reaction mixture is already at equilibrium.Hence, option C is correct

Assertion :Reaction quotient is defined in the same way as equilibrium constant at any stage of the reaction. Reason: If $Q_{c}$ (reaction quotient) $< K_{c}$ (equilibrium constant reaction moves in direction of reactants).