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Q.

An inorganic salt solution 'M' gives white precipitate with Pb(OAc)2 solution. The ppt. dissolves on warming but forms needle like crystals on cooling. The salt 'M' contains :

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a

'M'-Sulphite

b

M'-Chloride

c

'M'-Bromide

d

'M'-Iodide

answer is A.

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Detailed Solution

Lead chloride  PbCl2 dissolves on warming but forms needle like crystals on cooling.

Cl+Pb(OAc)2→ white ppt 

PbCH3COO2+2HCl→PbCl2+2CH3COOH

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