Sol. (a) (i)
Zinc is more reactive than silver. It will CD displace silver from silver
(ii) Magnesium is more reactive than iron. It will displace
iron from iron (II) chloride solution.
(iii) Copper is less reactive than magnesium. It will not
displace magnesium form magnesium sulphate solution. No
(b) X is potassium (K).
Potassium being soft can be cut by a knife and being
lighter than water will float at the surface.
The heat produced during reaction with water will melt
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