4. Give reasons for the following. (a) Copper cannot displace iron from its salt solution. (b) White phosphorus is stored in water. (c) Copper but not silver is used for making electrical wires.
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a) Copper cannot displace iron from iron sulphate because copper is less reactive than iron.
b) White phosphorus is highly reactive, and spontaneously ignites at about 30°C in moist air. It is usually stored under water, to prevent exposure to the air. It is also extremely toxic, even in very small quantities. (See Hazard warnings below.)
c) Silver is a better conductor, non magnetic but expensive material compared to copper therefore copper is generally used for electrical wiring.
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