Discussion
Which of the following reactions are not feasible ?
Answer: C
The reaction that is not feasible is Zn + \(\text{CaSO}_{4}\).
A metal displaces another from its salt solution only if it is more reactive. The reactivity series runs, from most to least reactive: potassium, sodium, calcium, magnesium, aluminium, zinc, iron, lead, copper. Zinc is less reactive than calcium, so it cannot displace calcium from calcium sulphate.
The others are possible on reactivity: iron is above lead, aluminium is above copper and magnesium is above zinc, so each of those metals can displace the less reactive metal from its sulphate.
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