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Crystals of Salts

The colour of...

Question

The colour of solid product formed on heating ferrous sulphate is
(a) Colourless (b) reddish brown ,(c) green (d) black

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Solution

The colour will be reddish brown.

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Q. On heating green coloured ferrous sulphate crystals, a reddish brown solid is left out and the smell of a gas having the odour of burning sulphur is obtained. Identify the type of reaction involved.

Q. When a student heated a colourless solid compound, then brown fumes of a gas are evolved. The colourless solid is most likely to be :
(1) ferrous sulphate
(2) lead carbonate
(3) lead nitrate
(4) lead sulphate

Q. (a) What is the colour of ferrous sulphate crystals? How does this colour change after heating?
(b) Name the product formed on strongly heating ferrous sulphate crystals. What type of chemical reaction occurs in this change?

Q. (a) What is the colour of ferrous sulphate crystals? How does this colour change after heating?
(b) Name the products formed on strongly heating ferrous sulphate crystals. What type of chemical reaction occurs in this change? Write chemical equation of the reaction.

Q. You are given the following materials:
(i) Iron nails
(ii) Copper sulphate solution
(iii) Barium chloride solution
(iv) Copper powder
(v) Ferrous sulphate crystals
(vi) Quicklime

Identify the type of chemical reaction taking place when:
(a) Barium chloride solution is mixed with copper sulphate solution and a white precipitate is observed.
(b) On heating copper powder in air in a china dish, the surface of copper powder turns black.
(c) On heating green coloured ferrous sulphate crystals, reddish brown solid is left and smell of a gas having odour of burning sulphur is experienced.
(d) Iron nails when left dipped in blue colour copper sulphate solution become brownish in colour and the blue colour of copper sulphate fades away.
(e) Quick lime reacts vigorously with water releasing a large amount of heat.
Write chemical equations for each one of the above reactions.

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