Question

What do you observe when
(i) Excess ammonia is mixed with chlorine.
(ii) Ammonia in excess is mixed with chlorine.
(iii) Filter paper dipped in colourless phenolphthalein is introduced into ammonia.
(iv) Ammonia is passed over heated lead oxide.
(v) Ammonia solution is added to ferric chloride solution.
(vi) Ammonia solution is added drop by drop and then in excess to aqueous copper sulphate solution.
(vii) Ammonia comes in contact with the eyes of a person.

Answer 1

(i) When excess ammonia reacts with chlorine, the yellowish green colour of chlorine gas disappears and white-coloured ammonium chloride is formed.

(ii) When ammonia is mixed with an excess of chlorine, nitrogen trichloride is formed, which is yellow in colour.
Disclaimer: The asked question should be "Ammonia is mixed with excess of chlorine."

(iii) When filter paper dipped in colourless phenolphthalein is introduced into ammonia, it turns deep pink in colour.

(iv) When ammonia is passed over heated lead oxide, the yellow lead monoxide is reduced into grey-coloured lead metal.

(v) When ammonia solution is added to ferric chloride solution, we get a reddish brown precipitate of iron hydroxide.

(vi) On addition of ammonium hydroxide to copper sulphate, bluish white precipitate of copper hydroxide is first formed. Then after the addition of excess ammonium hydroxide, the precipitate dissolves in the excess ammonium hydroxide to form deep blue tetrammine copper (II) sulphate.

(vii) Ammonia affects the lachrymal glands and causes tearing of the eyes.