Assertion :Ammonium ion belongs to zero group. Reason: Generally, the salts of ammonia are soluble in water.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Ammonium ion belongs to zero group as ammonium is a non-metallic cation and it has different reagents for testing. Its qualitative analysis is done with $N a O H$ . The other groups use $N H_{4} O H$ as reagents. Hence, $N H_{4}^{+}$ is tested first keeping it in zero group.

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Assertion (A) o-nitrophenol is less soluble in water than the m- and p-isomers.
Reason (R) m and p-nitrophenols exist as associated molecules.
(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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