Question

Which of these is a covalent compound?

Answer 1

Answer : The correct option is, (A) $NO_2$

Explanation :

Ionic bond : It is defined as the bond which is formed by complete transfer of electrons from one atom to another atom.

The ionic compound is formed between a metal and a non-metal.

Covalent bond : It is defined as the bond that is formed when sharing of electrons takes place between the atoms.

The covalent compound is formed between two non-metals.

(a) $NO_2$

It is a covalent compound in which nitrogen and oxygen are non-metals. The $NO_2$  is formed when one nitrogen atom share their electrons with two oxygen atoms.

(b) $LiCl$

It is an ionic compound in which lithium is a metal and chlorine is a non-metal. The $LiCl$  is formed by the complete transfer of electrons.

(c) $AlCl_3$

It is an ionic compound in which aluminum is a metal and chlorine is a non-metal. The $AlCl_3$  is formed by the complete transfer of electrons.

(d) $Na_2S$

It is an ionic compound in which sodium is a metal and sulfur is a non-metal. The $Na_2S$  is formed by the complete transfer of electrons.

Hence, the covalent compound is $NO_2$

Answer 2

A. NO2 because the elements are both nonmetals.