i. When lead nitrate reacts with potassium iodide, it forms a yellow coloured precipitate of lead iodide along with potassium nitrate.
ii. This type of reaction is a double displacement reaction.
iii. [PbNO3]2 + 2KI → 2KNO3 + PbI2
PbNO3 is lead nitrate.
KI is potassium iodide.
KNO3 is potassium nitrate.
PbI2 is lead iodide.
i. X is Cu.
Y is CuO.
ii. This a redox chemical reaction. Here, copper gets oxidised by heating to copper oxide, and hydrogen reduces copper oxide back to copper.
iii. Cu + O2 → 2CuO
CuO + H2 → Cu + H2O
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