Sodium thiosulphate (Na₂S₂O₃) is used as a fixing agent in the development of photographic film and paper. It dissolves the unexposed silver halide crystals remaining on the film or paper after development, making the image permanent and insensitive to further light exposure.
The hypo solution used in photography is the aqueous solution of
Asked in UPPCS Prelims 2010 · Topic: Inorganic Chemistry (Chemistry of Main Group Elements (s-block and p-block))
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