Which of the following equation represent oxidation, reduction reaction? Identify each oxidising agent and each reducing agent.
a) `K O H+H_2 O_2 rarr K H O_(2+)H_2 O`
b) `Cr_2 O_7^(2-)+2 OH^- rarr 2 CrO_4^(2-)+H_2 O`
c) `K+O_2 rarr K_2 O `
d) `Ca(HCO_3)_2 rarr CaCO_3+CO_2+H_2 O`

Explanation

i) .a, b. and .d. are not redox, reactions.
c is a redox reaction. The oxidising agent is .O_2. and reducing agent is .K..