Match the items of Column I and Column II.

	Column I		Column II
A)	Lechlanche cell	p)	Cell reaction: $2{\mathrm{H}}_2+{\mathrm{O}}_2\to 2{\mathrm{H}}_2\mathrm{O}$
B)	Ni–Cd cell	q)	Does not involve any ion in solution and is used in hearing aids.
C)	Fuel cell	r)	Rechargeable
D)	Mercury cell	s)	Reaction at anode, Zn$\to$$Z{n}^{2+}$+ $2e^{-}$
		t)	Converts energy of combustion into electrical energy

In Lechlanche cell:

$$\begin{gathered} \mathrm{Anode}: {\mathrm{Zn}}_{\left(\mathrm{s}\right)}\to {\mathrm{Zn}}^{2+}+2{\mathrm{e}}^{-} \\ \mathrm{Cathode}: {\mathrm{MnO}}_2+{\mathrm{NH}}_4^{+}+{\mathrm{e}}^{-}\to {\mathrm{Mn}}_2{\mathrm{O}}_3+{\mathrm{NH}}_3+{\mathrm{H}}_2\mathrm{O} \end{gathered}$$

Ni-Cd cell is a secondary cell which is rechargeable.

Fuel cell produce electrical energy from combustion reaction of fuel. Its cell reaction:

$2{\mathrm{H}}_2+{\mathrm{O}}_2\stackrel{∆}{\to }2{\mathrm{H}}_2\mathrm{O}$

Mercury cell does not involve any ion in the solution and used in low current devices such as hearing aids, watches, calculators and many more. Mercury cell does not involve any ion in the solution and used in low current devices such as hearing aids, watches, calculators and many more.