Which of the following reactions is possible? (i) ZnSO 4 aq + Cu s → CuSO 4 aq + Zn s (ii) Zn s + CuSO 4 aq → ZnSO 4 aq + Cu s

From the given reactions, only the (ii) reaction is possible. That is, Zn s + CuSO 4 aq → ZnSO 4 aq + Cu s Here, zinc is more reactive than copper. Therefore, it can replace copper from copper sulphate solution. That is, in general, a more reactive metal can replace the less reactive metal from its solution. Hence, the given reaction is a single displacement reaction.

An alloy is a homogeneous mixture of two or more metals or a metal and non-metal. Alloys are non-corrosive and durable. For example, i. Stainless steel is an alloy of iron with nickel and cobalt. It is used for vessels, construction etc. ii. Brass is an alloy of copper and zinc. It is used in machinery parts.

It is the process of concentrated ore is heated strongly to a high temperature in the presence of excess air. In this process metal sulphide ores are converted to metal oxide. For example, 2 ZnS s + 3 O 2 g → heat 2 ZnO s + 2 SO 2 g

Corrosion is the process of deterioration or eating up of metal as a result of its reaction with air or water present in the environment. For example, i. Silver article become black after sometimes when exposed to air. ii.Rusting of iron.