CBSE Class 12 Chemistry 2019 Outside Delhi Set 2 Solved Paper

Question : 8 of 27

Marks: +1, -0

Write balanced chemical equations for the following processes:
(a)

{\Cl}_2

is passed through slaked lime.
(b)

{\SO}_2

gas is passed through an aqueous solution of

{\Fe}

(III) salt.
OR
(a) Write two poisonous gases prepared from chlorine gas.
(b) Why does

{\Cu}^{2+}

solution give blue colour on reaction with ammonia?

Solution:

(b)

{\Cu}^{2+}

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.

{\Cu}^{2+}( {\aq})+4 ( {\NH}_3) ( {\aq}) → [ {\Cu} ( {\NH}_3) _4] ^{2+}

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