Exercise

Write the electrode reaction for electrolysis of molten magnesium chloride and calcium chloride.

Write down a balanced chemical equation for the following reaction:

$\mathrm{Calcium} \mathrm{chloride} + \mathrm{Sulfuric} \mathrm{acid} \to \mathrm{Calcium} \mathrm{sulphate} + \mathrm{hydrogen} \mathrm{chloride}$

Some more examples of redox reaction are as follows. Identify the reductants and oxidants from them.

$2{\mathrm{H}}_2\mathrm{S} + {\mathrm{SO}}_2 \to 3\mathrm{S}\downarrow + 2{\mathrm{H}}_2\mathrm{O}$

${\mathrm{MnO}}_2 + 4 \mathrm{HCl} \to {\mathrm{MnCl}}_2 + 2{\mathrm{H}}_2\mathrm{O} + {\mathrm{Cl}}_{2 }\uparrow$

Which is the oxidant used for purification of drinking water?

What is the difference in the process of dissolution and a chemical reaction?

If oxidation means losing electrons, what is meant by reduction?

Write down the steps in balancing the equation:

${{\mathrm{N}}_2}_{\left(\mathrm{g}\right)} + {{\mathrm{H}}_2}_{\left(\mathrm{g}\right)} \to {{\mathrm{NH}}_3}_{\left(\mathrm{g}\right) }$

What is the requirement for writing molecular formulae of different compounds? How are the molecular formulae of the compounds written?