Kerala Board Solutions for Chapter: Basic Constituents of Matter, Exercise 8: Let us assess

$\mathrm{N}$ is the symbol of nitrogen.

What do ${\mathrm{N}}_{2,} 2\mathrm{N}, 2{\mathrm{N}}_2$ indicate.

N is the symbol of nitrogen.

How many molecules and atoms are present in $5{\mathrm{N}}_2$?

Some chemical equations are given.

$$\begin{gathered} \mathrm{C}+{\mathrm{O}}_2\to {\mathrm{CO}}_2 \\ {\mathrm{CH}}_4+2{\mathrm{O}}_2\to {\mathrm{CO}}_2+2{\mathrm{H}}_2\mathrm{O} \\ {\mathrm{N}}_2+{\mathrm{O}}_2\to \mathrm{NO} \\ {\mathrm{CaCO}}_3\to \mathrm{CaO}+{\mathrm{CO}}_2 \\ {\mathrm{H}}_2+{\mathrm{I}}_2\to \mathrm{HI} \\ \mathrm{Fe}+\mathrm{HCl}\to {\mathrm{FeCl}}_2+{\mathrm{H}}_2 \\ {\mathrm{CO}}_2+\mathrm{C}\to \mathrm{CO} \end{gathered}$$

Which of these are balanced chemical equations?

Some chemical equations are given.

$$\begin{gathered} \mathrm{C}+{\mathrm{O}}_2\to {\mathrm{CO}}_2 \\ {\mathrm{CH}}_4+2{\mathrm{O}}_2\to {\mathrm{CO}}_2+2{\mathrm{H}}_2\mathrm{O} \\ {\mathrm{N}}_2+{\mathrm{O}}_2\to \mathrm{NO} \\ {\mathrm{CaCO}}_3\to \mathrm{CaO}+{\mathrm{CO}}_2 \\ {\mathrm{H}}_2+{\mathrm{I}}_2\to \mathrm{HI} \\ \mathrm{Fe}+\mathrm{HCl}\to {\mathrm{FeCl}}_2+{\mathrm{H}}_2 \\ {\mathrm{CO}}_2+\mathrm{C}\to \mathrm{CO} \end{gathered}$$

Balance those equations which are not balanced.

All atoms of the same element show the same properties.

The atoms present in a compound are different.

Elements are pure substances.

Hydrogen is a monatomic molecule.