Question

Match the following:

$\begin{array}{cccc}\left(i\right)& \text{Water}& \left(A\right)& \text{Compound}\\ \left(ii\right)& \text{Hydrogen}& \left(B\right)& \text{Element}\\ \left(iii\right)& \text{Table salt}& & \\ \left(iv\right)& \text{Gold}& & \\ \left(v\right)& \text{Carbon dioxide}& & \\ \left(vi\right)& \text{Iron}& & \end{array}$
The correct pairs are:-

• A. (i, iii, iv) – A, (ii, v, vi) - B
• B. (i, iii, v) – A, (ii, iv, vi) - B
• C. (i, ii, v) – A, (iii, iv, vi) - B
• D. (i, ii, iii) – A, (iv, v, vi) - B

Answer 1

The correct option is B

(i, iii, v) – A, (ii, iv, vi) - B

Water ($H_{2}O$ ) is formed by the chemical composition of hydrogen and oxygen. Therefore, it is a compound.

Hydrogen is composed of only one kind of atoms, hence, it is an element.

Sodium chloride (NaCl) is also known as table salt. It is formed by the chemical composition of sodium and chlorine. Therefore, it is also a compound.

Gold is composed of only one kind of atoms, hence it is an element.

Carbon dioxide ($C{O}_2$) is formed by the chemical composition of carbon and oxygen. Therefore, it is a compound.

Iron is composed of only one kind of atoms, hence, it is an element.