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Standard XII

Chemistry

Chemical Properties of Boron Family

When a metal ...

Question

When a metal 'M' is treated with $N a O H$ , 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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Solution

The correct option is D Al
$2 A l + 6 H_{2} O \to 2 A l (O H)_{3} + 3 H_{2}$
M X

$A l (O H)_{3} + N a O H \to N a [A l (O H)_{4}]$
soluble

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

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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:

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When a metal 'M' is treated with NaOH, a gelatinous precipitate 'X' is obtained, which is soluble in excess of NaOH. The compound 'X' when heated strongly, gives an oxide which is used in chromatography as an adsorbent. The metal 'M' is:

The correct option is D Al2Al+6H2O→2Al(OH)3+3H2 M X Al(OH)3+NaOH→Na[Al(OH)4] soluble 2Al(OH)3△−→Al2O3+3H2O Alumina

When a metal 'M' is treated with $N a O H$ , 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:

The correct option is D Al
$2 A l + 6 H_{2} O \to 2 A l (O H)_{3} + 3 H_{2}$
M X

$A l (O H)_{3} + N a O H \to N a [A l (O H)_{4}]$
soluble

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