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Test for Ammonia

Which of the ...

Question

Which of the following gas when bubbled through copper sulphate solution form a deep blue coloured solution?

A

Sulphur dioxide

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B

Hydrogen sulphide

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C

Ammonia

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D

Hydrogen chloride

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Solution

The correct option is C Ammonia
The alkali metals, alkaline earth metals and transition metals like copper dissolve in liquid ammonia producing blue solutions. It is proven that this blue colour is due to solvated electron. These solutions can reduce other chemical species. As the concentration of dissolved metal increases the solution becomes deeper blue in colour.

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Q. An aqueous solution of a gas (X) shows the following reactions :
(i) It turns red litmus blue
(ii) When added in excess to a copper sulphate solution, a deep blue colour is obtained.
(iii) On addition to a ferric chloride solution, a brown precipitate, soluble in dilute nitric acid, is obtained.

Q. When an aqueous solution of gas

(X)

is added in excess to a copper sulphate solution, a deep blue color is obtained, then gas is :

Q. When the excess of ammonia is added to the copper sulphate solution, the deep blue coloured complex is formed. The complex is_________.

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.

Passage of Ammonia gas through copper sulphate solution forms pale blue precipitate of ___ .

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