CBSE Class 12 Chemistry 2019 Outside Delhi Set 2 Solved Paper

Question : 8

Total: 27

Write balanced chemical equations for the following processes:
(a) Cl2 is passed through slaked lime.
(b) SO2 gas is passed through an aqueous solution of Fe (III) salt.
OR
(a) Write two poisonous gases prepared from chlorine gas.
(b) Why does Cu2+ solution give blue colour on reaction with ammonia?

Solution:

(b) Cu2+ ion reacts with ammonia solution to form a deep blue coloured complex because of the property of ammonia to form complex compounds. Ammonia acts as a lewis base due to presence of lone pair of electrons on the nitrogen atom. Hence, it is able to form coordinate bond with electron deficient molecules or a number of transition metal cations.
Cu2+(aq)+4(NH3)(aq)→[Cu(NH3)4]2+

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