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JEE Main levelSingle correct optionDifficulty 2 of 3qc081

A colourless solution gives a white precipitate with $NaOH$ . The precipitate dissolves in excess $NaOH$ and also in excess $NH X_{4} OH$ . The cation is

A $Mg X^{2 +}$
B $Mn X^{2 +}$
C $Zn X^{2 +}$
D $Al X^{3 +}$

Answer: C

Zn (OH) X_{2}

dissolves in excess alkali as

[Zn (OH) X_{4}] X^{2 -}

and in excess ammonia as

[Zn (NH X_{3}) X_{4}] X^{2 +}

.

Al (OH) X_{3}

dissolves only in NaOH, while

Mn (OH) X_{2}

and

Mg (OH) X_{2}

dissolve in neither.

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