“Oxidation and reduction processes occur simultaneously”. Justify the statement with the help of an example.

You are given the following materials:

(i) Marble chips (ii) Dilute hydrochloric acid (iii) Zinc granules.

(a) Write a balanced chemical equation for the reaction involved.
(b) What other name is given to the precipitation reaction
(c) On adding dilute hydrochloric acid to the reaction mixture, the precipitate disappears. Why?

Balance the following chemical equations and identify the type of reaction involved.

${\mathrm{H}}_2\mathrm{S}\left(\mathrm{g}\right)+\mathrm{}{\mathrm{O}}_2\left(\mathrm{g}\right)\mathrm{}\to \mathrm{S}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

Balance the following chemical equations and identify the type of reaction involved.

$\mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+\mathrm{C}\mathrm{O}\left(\mathrm{g}\right)\to \mathrm{F}\mathrm{e}\left(\mathrm{s}\right)+\mathrm{C}{\mathrm{O}}_2\left(\mathrm{g}\right)$

Balance the following chemical equation and identify the type of reaction involved.

$\mathrm{F}\mathrm{e}\mathrm{S}{\mathrm{O}}_4\left(\mathrm{s}\right)\to \mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+\mathrm{S}{\mathrm{O}}_2\left(\mathrm{g}\right)+\mathrm{S}{\mathrm{O}}_3\left(\mathrm{g}\right)\mathrm{}$