Match List - I with List - II.
$\begin{array}{cccc}& \text{List-I}& & \text{List-II}\\ \text{(a)}& Li& \text{(i)}& \text{absorbent for}\\ & & & \text{carbon dioxide}\\ \text{(b)}& Na& \text{(ii)}& \text{electrochemical cells}\\ \text{(c)}& KOH& \text{(iii)}& \text{coolant in fast}\\ & & & \text{breeder reactors}\\ \text{(d)}& Cs& \text{(iv)}& \text{photoelectric cell}\end{array}$
Choose the correct answer from the options given below:

$C{O}_2$ is acidic in nature and $KOH$ is a strong base. Hence, $C{O}_2$ is absorbed by $KOH$ solution and both react to form potassium carbonate and water.
$Li$ is used in making electrochemical cells like Li-ion batteries, as it is lighter, cheaper , has high energy density & electrode potential.
$Cs$ having very low ionisation enthalpy, easily emits electrons when exposed to sunlight. Hence it is widely used in photoelectric cells.
Liquid $Na$ is used as a coolant in fast breeder reactors on account of its excellent heat transfer properties.


$KOH\to$ Absorbs $C{O}_2$
$Li\to$ Used in Electro chemical cells
$Na\to$ Coolant in fast breeder reactors
$Cs\to$ Used in photoelectric cells