Question

Which of the following pairs will give displacement reactions?
(a) Zinc sulphate solution and aluminium metal (b) Ferrous sulphate solution and silver metal (c) Magnesium chloride solution and aluminium metal
(d) Silver nitrate solution and copper metal.

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Answer 1

In a displacement reaction, a more active metal displaces a less active metal from its solution to form a new solution. In this case copper being placed higher in the metal activity series will be able to displace silver from silver nitrate solution to form copper nitrate solution and precipitate metallic silver.



(copper) + (silver nitrate) → (silver) + (copper nitrate)

Answer 2

Answer: Zinc sulphate solution and aluminium metal , Silver nitrate solution and copper metal.

Explanation:

Displacement reactions : Those reactions which involve the displacement of a less reactive element  by a more reactive element from its compound are known as displacement reactions . The reactivity of an element can be known with the help of the reactivity series.

Between Aluminium and Zinc, the more reactive element is Aluminium , itreplaces zinc from the Zinc sulphate solution. Between copper and silver nitrate solution, the more reactive element is copper, and it replaces silver from silver nitrate solution.