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Decomposition Reaction

Name the type...

Question

Name the type of reaction for the following - vegetable matter changing into compost,burning of natural gas,silver items turning black when left in air and change in colour of copper sulphate from blue to green on dipping a nail

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Solution

Vegetable matter changing into compost - Decomposition reaction
Burning of natural gas - Oxidation reaction
Silver items turning black when left in air - Oxidation reaction
Change in colour of copper sulphate from blue to green on dipping a nail - Displacement reaction

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Q. On keeping iron nails in blue colour copper sulphate solution it is observed that the colour of the solution turns green after sometimes give reason for this colour change in the type of reaction

Why does the blue colour of copper sulphate solution changes to green colour when an iron nail is dipped in it ? Write chemical equation.

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. The colour of copper sulphate solution change when an ____ nail is dipped into it.

Q. Identify the type of chemical reaction taking place and also write the balance chemical equation for :Iron nails when left dipped in blue copper sulphate solution, It becomes brownish in colour and the blue colour of copper sulphate fades away.

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