What happens when - ( Write equation, colour change and type)a) Zinc rod is displaced in copper sulphate solution.b) Ferrous sulphate_(s) is heated.c) Lead nitrate is heated.d) Potassium iodide_(aq) is added to lead nitrate solution.

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Solution

a) Zinc rod is displaced in copper sulphate solution
Reaction:
Zn + CuSO₄ $\to$ ZnSO₄+ Cu
Color: The blue colour of copper sulphate solution slowly discharge. Zinc sulphate is colourless.
Type- Single displacement reaction

b) Ferrous sulphate is heated.
Reaction:
2 FeSO₄ $\overset{H e a t}{\to}$ Fe₂O₃ + SO₂ + SO₃
Colour: Green colour of ferrous sulphate changes into reddish brown colour of ferric oxide.
Type: Decomposition reaction

c) Lead nitrate is heated.
Reaction:
2 Pb(NO₃)₂ $\overset{H e a t}{\to}$ 2 PbO(s) + 4 NO₂(g) + O₂ (g)
Colour change: White crystalline lead nitrate changes into yellow residue of lead oxide with cracking noise.
Type: Decomposition reaction

d) Potassium iodide is added to lead nitrate solution
Reaction:
Pb(NO₃)₂(aq) + KI(aq) $\to$ KNO₃ + PbI₂(s)
Colour change: Both solution are colour less, on reaction forms yellow precipitate of lead iodide
Type: Precipitation reaction

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Q. Beakers A, B, and C contain zinc sulphate, silver nitrate, and ferrous sulphate solutions respectively. Copper pieces are added to each beaker. Blue colour solution will appear in case of beaker:

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

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

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

What do you observe when

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(b) Chlorine water is exposed to sunlight.

(d) $H_{2} S$ gas is passed through copper sulphate solution.

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A solution of copper sulphate, zinc sulphate, lead sulphate and silver nitrate of same concentration are taken in beakers. A zinc rod is dipped in each solution separately. In which beaker(s) will you observe the displacement reaction?

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
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What happens when - ( Write equation, colour change and type)a) Zinc rod is displaced in copper sulphate solution.b) Ferrous sulphate(s) is heated.c) Lead nitrate is heated.d) Potassium iodide(aq) is added to lead nitrate solution.

What happens when - ( Write equation, colour change and type)a) Zinc rod is displaced in copper sulphate solution.b) Ferrous sulphate_(s) is heated.c) Lead nitrate is heated.d) Potassium iodide_(aq) is added to lead nitrate solution.