Write the formula of zinc sulphate. Also write the elements present in it.

Explanation

Precipitation reactions: The reactions in which precipitates are formed are called precipitation reactions.
Examples : (i) When sodium sulphate solution is mixed with barium chloride solution in a test tube and left undisturbed. for some time after gentle shaking, then white precipitate of barium sulphate are formed.
`underset("sulphate")underset("Sodium")(Na_2SO_4(aq))+underset("chloride")underset("Barium")(BaCl_2(aq)) rarr underset("sulphate")underset("Barium")(BaSO_4 (darr))+ underset("chloride")underset("Sodium")(2NaCl (aq))`
(ii) When dilute HCL is added to sodium carbonate in a boiling tube drop by drop and gas thus evolved is passed through lime water then precipitate of insoluble calcium carbonate are formed.
`Na_2 CO_3(s)+2HCl(aq) rarr 2NaCl(aq) + H_2O(l) + CO_2(g)`
`underset("Lime water")(Ca(OH)_2 (aq)) + CO_2(g) rarr underset("Milky suspension")(CaCO_3(darr))+ H_2O(l)`