Which of the following facts regarding boron and silicon is true ?

Boron and silicon are semiconductors

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Boron and silicon form halides which are hydrolysed

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Boron and silicon react with magnesium to silicide which are decomposed by acids to give volatile borane and silane, respectively

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Both boron and silicon react with alkalis to form borates and silicates containing

B O_{4}

and

S i O_{4}

tetrahedral units, respectively

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Solution

The correct option is B Boron and silicon form halides which are hydrolysed
The chlorides of both are liquid, fumes in air and readily hydrolysed by water.
$B C l_{3} + 3 H_{2} O \to B (O H)_{3} + 3 H C l$
$S i C l_{4} + H_{2} O \to S i (O H)_{4} + 4 H C l$
Also, borates are planar and not tetrahedral.

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