Solid calcium oxide was taken in a container and water was added slowly to it.

Write the name and the chemical formula of the product formed.

Write the balanced chemical equation for the following reaction:

Zinc carbonate (s) $\to$Zinc oxide (s) + Carbon dioxide (g).

Select the oxidising agent and reducing agent in the reaction:

$4\mathrm{Na} + {\mathrm{O}}_2 \to 2{\mathrm{Na}}_2\mathrm{O}$

When sulphur dioxide is passed through a saturated solution of hydrogen sulphide, the following reaction occurs:

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

Predict the reducing agent and oxidising agent in this reaction.