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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Similar questions

complete the following reaction to predirect the products formed:

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

ii. Zinc sulphate pellets are added to an aqueous solution of hydrocloric acid.

What do you observe when

(a) dilute sulphuric acid is added to granulated zinc ?

(b) a few pieces of iron are dropped in a blute solution of sodium chloride ?

(d) ferrous sulphate solution is added to an aqueous solution of sodium hydroxide.

(e) solid lead nitrate is heated ?

(f) when dilute sulphuric acid is added to barium chloride solution ?

Q. Excess of dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?

(a) State what happens when:
(i) Copper sulphate solution is electrolysed using a platinum anode.
(ii) Excess ammonia is passed through an aqueous solution of lead nitrate.
(iii) Washing soda is left exposed to dry air for long time.
(iv) Silver nitrate solution is added to dil. HCl.
(v) Hot concentrated sulphuric acid is added to sodium chloride crystals.

Q. Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solutions of copper (II) sulphate, zinc nitrate, lead nitrate, calcium chloride and iron (III) sulphate. Copy the following table and write the colour of the precipitate in (i) to (v) and the nature of the precipitate (soluble or insoluble) in (vi) to (x).

Aqueous salt Solution	Colour of precipitate when NaOH is added in a small quantity	Nature of precipitate (soluble or insoluble) when NaOH is added in excess
Copper (II) sulphate Zinc nitrate Lead nitrate Calcium chloride Iron (III) sulphate	(i) (ii) (iii) (iv) (v)	(vi) (vii) (viii) (ix) (x)

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1.An aqueous solution of lead nitrate is added to sodium sulphate. 2. Zinc sulphide pellets are added to an aqueous solution of HCL

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

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