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Standard XII

Chemistry

Chemical Properties of Boron Family

When metal 'M...

Question

When metal $^{'} M^{'}$ is treated with $N a O H$ , a white gelatinous precipitate $^{'} X^{'}$ is obtained, which is soluble in excess of $N a O H$ . Compound $^{'} X^{'}$ when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal $^{'} M^{'}$ is

Z n

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A l

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F e

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C a

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Solution

The correct option is B $A l$
$A l^{3 +} N a O H - --- \to A l (O H)_{3} ↓ white gelatinous precipitate Excess N a O H - ------- \to N a A l O_{2} Sodium meta aluminate (soluble)$

$2 A l (O H)_{3} Strong heating - ------- \to A l_{2} O_{3} + 2 H_{2} O$

$A l_{2} O_{3}$ is used in column chromatography.

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Similar questions

Q. 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:

Q. When a metal 'M' is treated with

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, a gelatinous precipitate 'X' is obtained, which is soluble in excess of

N a O H

. The compound 'X' when heated strongly, gives an oxide which is used in chromatography as an adsorbent. The metal 'M' is:

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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

The correct option is B AlAl3+NaOH−−−−→Al(OH)3↓white gelatinous precipitate Excess NaOH−−−−−−−−→NaAlO2Sodium meta aluminate (soluble) 2Al(OH)3Strong heating−−−−−−−−→Al2O3+2H2O Al2O3 is used in column chromatography.

When metal $^{'} M^{'}$ is treated with $N a O H$ , a white gelatinous precipitate $^{'} X^{'}$ is obtained, which is soluble in excess of $N a O H$ . Compound $^{'} X^{'}$ when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal $^{'} M^{'}$ is