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Byju's Answer

Standard XII

Chemistry

Chemical Properties of Boron Family

When metal 'M...

Question

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:

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Solution

The correct option is A Al
$A l + N a O H \to A l {(O H)}_{3} (w h i t e p p t)$

Aluminium hydroxide when reacted with excess sodium hydroxide, the soluble amphoteric compound formed is sodium tetrahydroxoaluminate(III).
$A l {(O H)}_{3} + N a O H e x c e s s \to N a [A l {(O H)}_{4}] s o l u b l e$

$A l {(O H)}_{3} h e a t - - \to A l_{2} O_{3} + 3 H_{2} O$

$A l_{2} O_{3}$ used as an adsorbent in column chromatography.

Hence, option A is correct

Suggest Corrections

Similar questions

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