Question

20) The chemical name of sand is

• A. Silicon
• B. Sodium silicate
• C. Silicon dioxide
• D. Calcium silicate

Answer 1

The correct option is C

Silicon dioxide

Explanation of the correct option -

(C)

• The chemical name of sand is silicon dioxide $\left({\mathrm{SiO}}_2\right)$.
• It is an oxide of silica and composed of the two most abundantly occurring elements - Silicon and Oxygen.
• It is found in white powdered form.
• It is used in the manufacturing of glass, concrete, etc.

Explanation for the incorrect options -

(A) Sand is made up of two components (Silicon + Oxygen), not only from silicon.

(B) The chemical composition of sodium silicate is $\left({\mathrm{Na}}_2{\mathrm{SiO}}_3\right)$. It is commonly known as water glass and is present in white - Powdered form. Hence it does not has a composition of sand (Silicon + Oxygen)

(C) The chemical composition of Calcium silicate is $\left({\mathrm{Ca}}_2{\mathrm{SiO}}_4\right)$. It is present in white powdered form. Hence it does not contains a chemical composition of sand (silicon + Oxygen)