Assertion : At $25^{o} C$ and 1 atmospheric pressure, $H_{2} O$ is a liquid but $H_{2} S$ is a gas
Reason : The molecular weight of $H_{2} O$ is less than that of $H_{2} S$

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Assertion : At 25 $^{o}$ C and 1 atmospheric pressure, H $_{2}$ O is a liquid but H $_{2}$ S is a gas.
H $_{2}$ O can form intermolecular hydrogen bonds. Hence, it has high boiling point.
H $_{2}$ S can not form intermolecular hydrogen bonds. Hence, it has low boiling point.
Reason : The molecular weight of H $_{2}$ O is less than that of H $_{2}$ S
The molecular weight of H $_{2}$ O is 18 g/mol.
The molecular weight of H $_{2}$ S is 34 g/mol.

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Similar questions

Q. Assertion: The compressibility factor for

H_{2}

and

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Reason: The compressibility factor for

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H e

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Assertion (A) Order and molecularity are same.

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

(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 : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

{2n}^{2}

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Q. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
High biological oxygen demand means low activity of bacteria in water.

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Assertion : At 25oC and 1 atmospheric pressure, H2O is a liquid but H2S is a gasReason : The molecular weight of H2O is less than that of H2S

Assertion : At $25^{o} C$ and 1 atmospheric pressure, $H_{2} O$ is a liquid but $H_{2} S$ is a gas
Reason : The molecular weight of $H_{2} O$ is less than that of $H_{2} S$