When strongly heated, Sodium thiosulphate disproportionates into compounds having ___ different oxidation states.

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Solution

In the following disproportionation reaction all are solids!

$5 N a_{2} S_{2} O_{3} Δ - \to 3 N a_{2} S_{2} O_{3} + N a_{2} S + 4 S$

Earlier, Hypo was extensively used in photography because it could form a complex with undecomposed Silver halide on the photographic plate.

$A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r$

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