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Iron nails become after being dipped in...

Iron nails become _______ after being dipped in copper sulphate solution.

A

greenish

B

bluish

C

brownish

D

greyish

Text Solution

Verified by Experts

The correct Answer is:
B
Iron nails become brownish in colour and blue colour of copper sulphate solution fade because when an iron nail is dipped in the copper sulphate solution because iron is more reactive than copper therefore the colour of copper sulphate solution changes.
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What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?

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), "Quick lime"):} 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 becomes black. (c) On heating green ferrous sulphate crystals, reddish brown solid is left and a gas having smell of burning sulphur is noticed. (d) Iron nails when left dipped in blue copper sulphate solution becomes brownish in colour and blue colour of copper sulphate solution fades away.

You are given the following materials: (i) Iron nails (ii) Copper sulphate solution (iii) Barium chioride 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 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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