Question

There is a mistake in each of the statements given below. Rewrite each of the statements by rectifying the mistakes:(i) The colour of the solution changes from green to blue when iron nails are dipped in zinc sulphate solution.
(ii) We can separate a mixture of common salt and potassium nitrate by fractional distillation.
(iii)Heating of ammonium chloride is an example of physical change.
(iv)The valency of calcium ion in the compound calcium bisulphate is 1.
(v)The density of matter may vary within a system but the volume occupied by the matter remains cons
(vi)The average kinetic energy of the

particles is directly proportional to the mass of
the substance​

Answer 1

Answer:

Solution

Correct option is

C

Observation of student C is correct as Fe cannot displace Zn from its ZnSO4 solution. On the other hand, Zn can displace Fe from FeSO4 solution to form ZnSO4 which is colourless and black coloured residue of Fe is formed. The chemical equation for this reaction can be written as:

Zn+FeSO4→ZnSO4+Fe

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