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NEET levelSingle correct optionDifficulty 1 of 3qc058

A white gelatinous precipitate that dissolves in excess $NaOH$ to give a clear solution is most likely

A $Cr (OH) X_{3}$
B $Ni (OH) X_{2}$
C $Fe (OH) X_{3}$
D $Al (OH) X_{3}$

Answer: D

Al (OH) X_{3}

is amphoteric:

Al (OH) X_{3} + OH X^{-} [Al (OH) X_{4}] X^{-}

gives a colourless solution.

Fe (OH) X_{3}

is brown and insoluble, and

Ni (OH) X_{2}

is green and insoluble in excess NaOH.

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