JEE Main | 2018Purification and characteristic of organic compounHard

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

Options

A.

Ca

B.

Al

C.

Fe

D.

Zn

Solution

Al + 3H2O →NaOH Al(OH)3 ↓+ 3/2H2(g)
                            (x)
               white gelatinous ppt.
                       ↓
soluble in excess of NaOH and form Na[Al(OH)4]
2Al(OH)3 →∆ Al2O3+3H2O
                used as adsorbent in chromatography
So metal is Al.

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