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Sulphuric Acid

Na2S2O3. FH2...

Question

$N a_{2} S_{2} O_{3} . F H_{2} O$ Sodium thiosulphate is used in photography to :

A

remove reduced silver

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B

remove undecomposed AgBr as soluble silver thiosulphate complex

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C

convert the metallic silver to silver salt

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D

None of the above

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Solution

The correct option is A remove undecomposed AgBr as soluble silver thiosulphate complex
$2 N a_{2} S_{2} O_{3} + A g B r U n e x p o s e d \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r$
This property is used for fixing in photography.

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