Question

10. Identify the substances that are oxidized and the substances that are reduced in the following reactions. Also mention the oxidizing and the reducing agent in each reaction -
a. CuO(s) + H2(g) >>>>> Cu(s) + H2O(l)

b. 2MnO2 + 4Al >>>> 2Mn + 2Al2O3

c. Pb(NO3)2 + KI >>>> PbI2 + KNO3

Answer 1

a)Cu is reduced and H2 is oxidised
b) Mn is reduced and al is oxidised
c) Pb is reduced and K is oxidised

Answer 2

Hii friend,

(1) CuO +H2 -> Cu +H2O

Here cupric oxide is "reduced" to copper and Hydrogen gas is "oxidised" to Water.

(2) 2MnO2 +4 Al -> 2Mn + 2Al2O3

Here manganese do oxide is "reduced" to element manganese and Aluminium is "oxidised" to "aluminum trioxide".

(3) Pb(No 3)2 + KI -> Pb I2 + KNO3

Here lead nitrate is "reduced" to lead first and then reacts to form lead iodide.
Potassium iodide is "oxidised" to Potassium nitrate.

Hope this helps you a little!!!