Kerala Board Solutions for Chapter: Basic Constituents of Matter, Exercise 7: Exercise 7

The reaction between zinc and hydrochloric acid can be represented as follows:

$\mathrm{Zn}+\mathrm{HCl}\to {\mathrm{ZnCl}}_2+{\mathrm{H}}_2$

$\mathrm{Zn}+\mathrm{HCl}\to {\mathrm{ZnCl}}_2+{\mathrm{H}}_2$

Rewrite the equation as follows:

$\mathrm{Zn}+2\mathrm{HCl}\to {\mathrm{ZnCl}}_2+{\mathrm{H}}_2$

Examine the number of atoms in the equation.

Now, look at the balanced chemical equations given below. Write down the reactants and products in the table:

(1) $\mathrm{C}+{\mathrm{O}}_2\to {\mathrm{CO}}_2$

(2) ${\mathrm{H}}_2+{\mathrm{Cl}}_2\to 2\mathrm{HCl}$

(3) $2{\mathrm{H}}_2+{\mathrm{O}}_2\to 2{\mathrm{H}}_2\mathrm{O}$

The equations given below are not balanced. Can you balance them?

$\mathrm{Mg}+{\mathrm{O}}_2\to \mathrm{MgO}$

$\mathrm{NaOH}+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{Na}}_2{\mathrm{SO}}_4+{\mathrm{H}}_2\mathrm{O}$

${\mathrm{N}}_2+{\mathrm{H}}_2\to {\mathrm{NH}}_3$

${\mathrm{H}}_2{\mathrm{O}}_2\to {\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2$