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Question

1.An aqueous solution of lead nitrate is added to sodium sulphate.

2. Zinc sulphide pellets are added to an aqueous solution of HCL

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Solution

1.A double displacement reaction will occur, with lead sulphate precipitating out of solution, it being almost insoluble in water

Pb(NO3)2 (aq) + Na2SO4 (aq) → PbSO4 (s) + 2NaNO3 (aq)

2.

Zn + 2HCl → ZnCl2 + H2S

This is an example of double displacement reaction where Chloride ion and Sulfide ion exchange their positions according to their stability and nature of elements. Hence Zinc Chloride {a salt} and Hydrogen Sulfide {gas} is evolved


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