Set - I	Set - II
A) Oxidation	1) Ca
B) Reduction	2) F
C) Oxidant	3) $\text{Zn}\to {\text{Zn}}^{2+}+2{\text{e}}^{-}$
D) Reductant	4) $\text{Cl}+{\text{ e}}^{-}\to {\text{Cl}}^{-}$

For A:  Oxidation means loss of electrons.

Ex: $\text{Zn}\to {\text{Zn}}^{2+}+2{\text{e}}^{-}$

In this example, Zn lost its two electrons and then forms cation, ${\text{Zn}}^{2+}$.

For B: Reduction means gain of electrons.

Ex: $\text{Cl}+{\text{ e}}^{-}\to {\text{Cl}}^{-}$ ;

Here, chlorine has gained electrons and converts as anion, ${\text{Cl}}^{-}$.

For C: Oxidant means the element which gains electrons and it undergoes reduction reaction. Ex: Non metal elements like F, O, and Cl etc…

For D: Reductant means the element which loses electrons and it undergoes oxidation reaction. Ex: metals like Ca, K, Na etc…