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Reactivity Towards Halogens

Both boron an...

Question

Both boron and silicon form binary compounds with other metals. One such example is__________.

A

calcium

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B

magnesium

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C

aluminium

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D

barium

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Solution

The correct option is B magnesium
Oxides of both are acidic and can be reduced by limited amount of $M g$ . In excess of $M g$ , boride and silicide are formed.
$B_{2} O_{3} + 3 M g ⟶ 3 M g O + 2 B$
$S i O_{2} + 2 M g ⟶ 2 M g O + S i$

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