(a) Name the substance oxidised and reduced in the following reaction : ZnO + C → Zn + CO [1] (b) Balance…
(a) Name the substance oxidised and reduced in the following reaction :
ZnO + C → Zn + CO [1]
(b) Balance the following chemical reaction :
Pb(NO3)2 + KI → PbI2 + KNO3 [1]
(c) Give one example each of electrolytic decomposition and decomposition by sunlight. [1]
Solution
(a)
• Substance oxidised - C
• Substance reduced - ZnO
(b) Pb(NO3)2 + 2 KI → PbI2 + 2 KNO3
(c)
electricity
• 2H2O → 2H2 + O2
sunlight
• 2AgCl → 2Ag + Cl2
(any other example in each case)