Which of the following facts regarding boron and silicon is…

Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Mix Single Correct MCQ

Published on: August 13, 2026

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

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 BO33– and SiO44– tetrahedral units, respectively.

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(a, c, d)

BCl3 + 3H2O H3BO3 + 3HCl ; SiCl4 + 3H2O H2SiO3 + 4HCl

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