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Occurence of Sulphuric Acid

On heating hy...

Question

On heating hydrated copper sulphate, it turns _________ colour.

A

Green

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B

White

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C

Blue

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D

Yellow

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Solution

The correct option is B White
Hydrated copper sulphate on heating changes its colour from blue to white.

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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.

Q. (a) During photosynthesis, green plants prepare glucose with the help of carbon dioxide from the air and water from the soil. Is photosynthesis a physical change or a chemical change? Justify your answer.
(b) Copper sulphate is a blue coloured chemical. When it is heated, the blue colour disappears and it turns white. After is cools, if a few drops of water are put into the test tube, the copper sulphate turns blue again. Is this a physical or a chemical change?

Q. Zinc sulphate forms a colourless solution in water. Will you observe any colour change on adding copper turning in it?

Q. Question 18
Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turnings in it?

Q. Question 18
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