1.

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

Answer»

Boron is used to make boron steel or boron carbide control rods for nuclear reactor.
Boron and silicon form HALIDES which are not hydrolysed.
Boron and silicon react with magnesium to form magnesium boride and magnesium silicide which are decomposed by acids to give VOLATILE borane and SILANE, respectively.
Both boron and silicon react with alkali to form borates and silicates containing `BO_(3)^(3-)` and `SIO_(4)^(4-)` tetrahedral units, respectively.

Solution :(B)`BCl_(3)+3H_(2)O overset("Hydrolysis")to H_(3)BO_(3) + 3HCl , SiCl_(4)+3H_(2)O overset("Hydrolysis")to H_(2)SiO_(3) + 4HCl`
( C)`B+Mg to Mg_(3)B_(2) +H_(3)PO_(4) to "Mix of borones" overset(Delta) to B_(2)H_(6)`
(D)`2B+6NaOH to 2Na_(3)BO_(3) + 3H_(2) , Si+4NaOH to Na_(4)SiO_(4) + 2H_(2)`


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