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Give reasons for the following: (a) A...

Give reasons for the following:
(a) Ammonia acts as a ligand.
(b) Sulphur disappears when boiled with an aqueous solution of sodium sulphite.

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(a) `NH_3` has lone pair of electrons , therefore , acts as ligand .
(b) It is due to formation of sodium thiosulphate
`Na_2SO_3 + S to underset("Sodium thiosulphate")(Na_2S_2O_3)`
`Na_2S_2O_3` is soluble in water .
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