What is reduction reaction ? Give its examples.

Explanation

.Removal of oxygen/electronegative element from a substance or addition of hydrogen/ electropositive element to a substance is known as rduction."
`2HgO_((s))to2Hg_((l))+O_(2(g))`
Oxygen removed from mercuric oxide.
`2FeCl_(3(aq))+H_(2(g))to2FeCl_(2(aq))+2HCl_((aq))`
Chlorine remove from ferric chloride.
`CH_(2)=CH_(2(g))+H_(2(g))toCH_(3)*CH_(3(g))`
(Addition of hydrogen in ethene)
`2HgCl_(2(aq))+SnCl_(2(aq))toHg_(2)Cl_(2(s))+SnCl_(4(aq))`
(Addition of Hg in `HgCl_(2)`)