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Why is Na2S2O3 used in photography?...

Why is `Na_2S_2O_3` used in photography?

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In photography, `Na_2S_2O_3` is used to dissolve the unexposed AgBr.
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CHHAYA PUBLICATION-s-BLOCK ELEMENTS -QUESTION-ANSWER ZONE FOR BOARD EXAMINATION (SHORT ANSWER TYPE)
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  12. Why is Na2S2O3 used in photography?

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