Assertion :The formation of a reddish-brown precipitate indicates ${F e}^{3 +}$ , while testing for 3rd group with standard addition of buffer mixture of ammonium hydroxide. Reason: The colour of ferric hydroxide is black.

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 C Assertion is correct but Reason is incorrect
While testing for 3rd analytical group of cations, the formation of a reddish brown precipitate indicates $F e^{+ 3},$ a gelatinous white precipitate indicates $A l^{3 +},$ a green precipitate indicates $C r^{+ 3}$ or $F e^{+ 2} .$
These last two are distinguished by adding $s o d i u m$ $h y d r o x i d e$ in excess to the green precipitate. If the precipitate dissolves $C r^{+ 3}$ is indicated, otherwise $F e^{+ 2}$ is present.
Also, the colors of $f e r r i c$ $h y d r o x i d e$ ranges from green to reddish brown depending on the $I r o n (I I I)$ content in it.

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Assertion :The formation of a reddish-brown precipitate indicates Fe3+, while testing for 3rd group with standard addition of buffer mixture of ammonium hydroxide. Reason: The colour of ferric hydroxide is black.

Assertion :The formation of a reddish-brown precipitate indicates ${F e}^{3 +}$ , while testing for 3rd group with standard addition of buffer mixture of ammonium hydroxide. Reason: The colour of ferric hydroxide is black.