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Zinc Ion

Sodium hydrox...

Question

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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Solution

Aqueous salt solution Colour of precipitate when NaOH is added in 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) Blue precipitate
(ii) White precipitate
(iii) White precipitate
(iv) White precipitate
(v) Reddish-brown precipitate (vi) Insoluble
(vii) Soluble
(viii) Soluble
(ix) Insoluble
(x) Insoluble

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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)

Q. The questions (i) to (v) refer to the following salt solutions listed (a) to (f):
(a) Copper nitrate
(b) Iron (II) sulphate
(c) Iron (III) chloride
(d) Lead nitrate
(e) Magnesium sulphate
(f) Zinc chloride

(i) Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?
(ii) Which two solution will give a white precipitate when treated with dilute nitric acid followed by silver nitrate solution?
(iii) Which solution will give a white precipitate when either dilute hydrochloric acid or dilute sulphuric acid is added to it?
(iv) Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it?
(v) Which solution gives a white precipitate with excess ammonium hydroxide solution?

Q. Write the name , colour and solubility of precipitate in excess of NaOH formed when-
1- Zinc Sulphate and
2- Ferric Chloride reacts sodium hydroxide

Q. Assertion :Ammonium hydroxide solution is added to zinc nitrate solution slowly and then in excess we see white precipitates are soluble Reason: Ammonium hydroxide solution is added to zinc nitrate solution slowly white precipitates of ammonium nitrate is formed and when ammonium hydroxide is added in excess then the white precipitates are soluble in it

Q. Sodium hydroxide solution is added to the solutions containing the ions mentioned in List X. List Y gives the details of the precipitate. Match the ions with their coloured precipitates.

List X	List Y
(i) Pb²⁺	(A) Reddish brown
(ii) Fe²⁺	(B) White insoluble in excess
(iii) Zn²⁺	(C) Dirty green
(iv) Fe³⁺	(D) White soluble in excess
(v) Cu²⁺	(E) White soluble in excess
(vi) Ca²⁺	(F) Blue

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