When metal M is treated with NaOH , a white gelatinous precipitate...

When metal

M

is treated with

NaOH

, a white gelatinous precipitate

X

is obtained, which is soluble in excess of

NaOH

. Compound

X

when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal

M

Options

A $Fe$
B $Zn$
C $Ca$
D $Al$

Correct answer

D. $Al$

Step-by-step solution

Alumina $\left({Al}_{2}{O}_{3}\right)$ is used in chromatography

$Al + NaOH \to \mathop{Al{( OH )}_{3}}_{( gelatinous )}\overset{NaOH( ex\text{cess} )}{\to}\mathop{{[ Al{( OH )}_{4} ]}^{-}}_{( soluble )}\overset{\Delta}{\to}{Al}_{2}{O}_{3}$

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