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Observations That Help Determine Chemical Change

On immersing ...

Question

On immersing the brown coloured iron nails in blue coloured copper sulphate solution, they displace from the copper sulphate solution and their colour becomes .

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Solution

On immersing the brown coloured iron nails in blue coloured copper sulphate solution, the displacement of copper by iron takes place and colour changes to light green.

Therefore the correct answer is copper, light green.

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Q. On immersing the brown coloured iron nails in blue coloured copper sulphate solution, they displace ................. from the copper sulphate solution and their colour becomes .....................

Q. When iron nail is dipped in a blue coloured copper sulphate solution then:

Q. Assertion :The colour of copper sulphate solution change when an iron nail is dipped in it. Reason: When an iron nail is placed in a copper sulphate solution, iron displaces copper from copper sulphate solution forming iron sulphate.

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. What do you observe when an iron nail is placed into a blue-coloured copper sulphate solution?

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Observations That Help Determine Chemical Change

Standard IX Chemistry

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