Question 9

I.

One of the following reactions is redox (oxidation-reduction). Determine which is redox and why.

(Explain your answer by calculating oxidation numbers as well as explaining in words why you

have chosen that reaction.)

a. Pb(NO3)2 +2KI Pbl₂ +2KNO3

(8 marks)

b. Fe + CuSO4 → FeSO4 + Cu

(4 marks)/nII.

Determine which is the oxidising agent and reducing agent in the following reaction. (Show

calculation and give reasons for your choices.)

Fe + O2 → Fe2O3

(4 marks)