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Assertion: Ammonia gas is lighter than air.

Reason: The molecular weight of ammonia is less than that of air.

Option: 1

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


Option: 2

Both assertion and reason are true, but the reason is not the correct explanation of the assertion.


Option: 3

The assertion is true, but the reason is false.

 


Option: 4

The assertion is false, but the reason is true.


Answers (1)

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Correct Option A 

The Assertion is true. Ammonia gas is lighter than air because it has a lower molecular weight than air. The molecular weight of ammonia is 17 g/mol, while the average molecular weight of air is 29 g/mol.

The Reason is also true and provides the correct explanation for the Assertion. The molecular weight of a gas determines its density relative to air. A gas with a lower molecular weight than air will be less dense and therefore lighter than air. Since ammonia has a lower molecular weight than air, it is less dense and lighter than air.  Hence option A is the correct answer.

Option (B) is incorrect because it incorrectly states that the assertion is correct but the reason is incorrect. Both the assertion and reason are correct. Hence option B is incorrect.

Option (C) is incorrect because it incorrectly states that the assertion is incorrect but the reason is correct. The assertion is correct, and the reason is also correct. Hence option C is incorrect.

Option (D) is incorrect because it incorrectly states that both the assertion and reason are incorrect. Both the assertion and reason are correct. Hence option D is incorrect.

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Gaurav

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