From the list of substances given-Ammonium sulphate, Lead carbonate, chlorine, Copper nitrate, Ferrous sulphate -State a solution of the compound which gives a dirty green precipitate with sodium hydroxide.

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Solution

Ferrous sulphate will give dirty green precipitates with sodium hydroxide due to the formation of ferrous hydroxide.

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Q. (d) Match the following:

	Column A	Column B
(i)	A substance that turns moist starch iodide paper blue.	Ferrous sulphate
(ii)	A compound which releases a reddish brown gas on reaction with concentrated sulphuric acid and copper turnings.	Chlorine
(iii)	A solution of this compound gives a dirty green precipitate with sodium hydroxide.	Copper nitrate
(iv)	A compound which on heating with sodium hydroxide produces a gas which forms dense white fumes with hydrogen chloride.	Lead carbonate
(v)	A white solid which gives a yellow residue on heating.	Ammonium sulphate

Q. From the list of the substances given, name the substances which you would use to prepare each of the following salts:
List of substances: copper, lead, sodium, zinc, copper oxide, lead carbonate, sodium carbonate solution, dilute hydrochloric acid, dilute nitric acid and dilute sulphuric acid.
Salts: (a) zinc sulphate (b) copper sulphate (c) sodium sulphate (d) lead sulphate.

Q. When sodium hydroxide solution is added to a freshly prepared solution of ferrous sulphate, a green precipitate of ferrous hydroxide is formed which on standing turns brown because:

(h) Name from the list of the substances given below, the substance which you would use to prepare the salts given below:
Copper, Lead, Sodium, Zinc, Copper Oxide, Lead Carbonate, Sodium Carbonate Solution, dil. HCl, dil. HNO₃, dil. H₂SO₄.
Salts:
(i) Zinc sulphate
(ii) Copper sulphate
(iii) Sodium sulphate
(iv) Lead sulphate

Q. Write the formula of the following compounds.
calcium hydroxide, copper chloride, iron sulphate, sodium carbonate, copper nitrate, copper oxide, lead sulphide, magnesium chloride, zinc sulphate, potassium hydroxide.

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