Assertion : $H C l$ is collected by upward displacement of air. Reason: $H C l$ gas is lighter than air.

If both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

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If both Assertion and Reason are correct, but Reason is not the correct explanation of the Assertion.

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If Assertion is correct, but Reason incorrect

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If Assertion is incorrect , but Reason is correct .

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Solution

The correct option is C If Assertion is correct, but Reason incorrect
Any gas with a molecular weight less than 29 will be lighter than air.
MW of HCl= 36.5 g/mol

$∴$ HCl gas is heavier than air.
Upward displacement of air is good for gases that are heavier/denser than air, and are soluble in water. HCl is both heavier and denser than air. Thus, HCl is collected by upward displacement of air.

Option C is correct

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Similar questions

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Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(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.

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Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

Assertion: All the points (1, 0), (-1, 0), (2, 0) and (5, 0) lie on the x – axis.
Reason: Equation of the x-axis is y = 0

Choose the correct option.

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 :HCl is collected by upward displacement of air. Reason: HCl gas is lighter than air.

Assertion : $H C l$ is collected by upward displacement of air. Reason: $H C l$ gas is lighter than air.