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Standard XII

Chemistry

Concentration of Ore

Amorphous bor...

Question

Amorphous boron of 95% to 98% purity is obtained by:

heating

B_{2} O_{3}

with

H_{2}

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heating

B_{2} O_{3}

with

M g

N a

at high temperature

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heating

K B F_{4}

with

N a

K

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heating

B B r_{3}

with

H_{2}

in presence of a catalyst

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Solution

The correct option is A heating $B_{2} O_{3}$ with $M g$ or $N a$ at high temperature
Amorphous boron is a brown powder which is not the pure form of boron. It is obtained by reduction of boric oxide with metals such as magnesium or aluminium and the product is contaminated with metal borides.

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Amorphous boron of 95% to 98% purity is obtained by:

The correct option is A heating B2O3 with Mg or Na at high temperatureAmorphous boron is a brown powder which is not the pure form of boron. It is obtained by reduction of boric oxide with metals such as magnesium or aluminium and the product is contaminated with metal borides.

The correct option is A heating $B_{2} O_{3}$ with $M g$ or $N a$ at high temperature
Amorphous boron is a brown powder which is not the pure form of boron. It is obtained by reduction of boric oxide with metals such as magnesium or aluminium and the product is contaminated with metal borides.