An inorganic compound (A) loses its water of crystallisation on heating and incorrect statement/s is/are about its aqueous solution (A is used to estimate I₂ in volumetric analysis)

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It gives white turbidity with dil.NaCl

It does not decolourises a solution of iodine in KI

It does not gives white ppt with AgNO₃ solution which turns black on standing

A is used as a fixing agent in photography

answer is A, B, D.

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Detailed Solution

The compund 'A' is hypo, Na₂S₂O₃ .5H₂O

$N a_{2} S_{2} O_{3} . 5 H 2 O \overset{Δ}{\to} N a_{2} S_{2} O_{3} + 5 H 2 O N a_{2} S_{2} O_{3} + H C l \overset{}{\overset{}{\to} 2 N a C l + H 2 O + S (t u r b i d i t y)} N a_{2} S_{2} O_{3} + I_{2} \overset{}{\to} N a_{2} S_{4} O_{6} + 2 N a I N a_{2} S_{2} O_{3} + A g N O_{3} \overset{}{\to} A g_{2} S_{2} O_{3} (w h i t e P P T) + N a N O_{3} A g_{2} S_{2} O_{3} + H_{2} O \overset{}{\to} A g_{2} S (B l a c k) + H_{2} S O_{4}$