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Write the principles involved in the est...

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

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(i) Halongens: Halogens reacts with silver nitrate to for precipitate of silver halides.
`X+Ag^(+)toAgX`
X represents a halogen -Cl-Br or -I
(ii)) Sulphur
`S^(+)[Fe(CN)_(5)NO]^(2)to[Fe(CN)_(5)NOS]^(4-)`
Sulphur reacts with notropresside to from a violet colour complex.
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