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B
Sodium thiosulphate
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C
Potassium sulphate
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D
Potassium nitrate
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Solution
The correct option is D Sodium thiosulphate
Sodium thiosulphate is a chemical which is readily soluble in water and is a mild reducing agent. Because of its tendency to dissolve silver salts, it is majorly used in photography for developing the film.
It is also used in chrome-tanning leather and in chemical manufacturing. It is also called sodium hyposulfite or hypo.