Assertion : 20 gm of argon (atomic mass of Ar $= 40)$ occupies volume of $22400 c m^{3}$ at STP.
Reason : 20 gm of Neon (atomic mass of $N e = 20$ ) occupies a volume of $22400 c m^{3}$ at STP.

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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Assertion is incorrect but Reason is correct.

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Both assertion and reason are incorrect.

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Solution

The correct option is E Assertion is incorrect but Reason is correct.
20 g of argon is 0.5 moles and it occupies $(0.5 \times 22400 =) 11200 c m^{3}$ at STP.
20 g of Neon is 1 mole and occupies a volume of $22400 c m^{3}$ at STP.

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Choose the correct option.

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