1.

Writ the principles involved in the estimation of (i) Halogens (ii) Sulphur present in an organic compound.

Answer»

(i) Halogens: Halogens reacts with silver nitrate to for precipitate of silver halides. 

X + Ag+ → AgX . 

X represents a halogen -Cl, -Br or -1

(ii) Sulphur 

S+ + [Fe(CN)5NO]2 → [Fe(CN)5NOS]4- 

Sulphur reacts with nitropresside to form a violet colour complex.



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