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Reactivity with Halogens and Hydrogen (Group 2)

Assertion :Al...

Question

Assertion :All the precipitates of 1st group that are formed by chlorides are white in colour, so they cannot be differentiated from each other. Reason: Precipitates of 1st group have some specific nature in different environment,which helps in their distinction.

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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B

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

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C

Assertion is correct but Reason is incorrect

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D

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
The group $1$ chlorides cannot be distinguished by their colours but can be differentiated from their solubility as $P b C l_{2}$ is soluble in hot water hence can be differentiated; and for another two cations $N H_{3}$ can be used to differentiate. $A g C l$ forms a complex with ammonia $[A g (N H_{3})_{2}]^{+}$ and $H g C l_{2}$ gives a black ppt. forming chloro-mercuric-amide.

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Reason (R) Nitro group helps in the stabilisation of the phenoxide ion by dispersal of negative charge due to resonance.
(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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