JEE Main · 2018 · 08 Apr 2018 · Offline · p-Block Elements

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 ' is :

(A)Fe
(B)Zn
(C)Ca
(D)Al✓ Correct

Answer: (D)

Solution

The clue is a white gelatinous hydroxide that dissolves in excess alkali and, on strong heating, leaves an oxide used as a chromatographic adsorbent. Aluminium fits every part, giving

Al (OH) X_{3}

with

NaOH

, redissolving in excess alkali as

Na [Al (OH) X_{4}]

, and on heating yielding

Al X_{2} O X_{3}

, the alumina used as an adsorbent, so the metal is aluminium.

JEE Main · 2018 · 08 Apr 2018 · Offline · Single correct option

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