Hypo is used in photography because of its:

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(C) In photography,hypo $(Na_2S_2O_3)$ is used as a fixing agent. It reacts with the undecomposed silver bromide $(AgBr)$ present on the photographic

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Removing undecomposed silver bromide as a soluble complex

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(C) In photography,hypo $(Na_2S_2O_3)$ is used as a fixing agent. It reacts with the undecomposed silver bromide $(AgBr)$ present on the photographic film to form a soluble complex,sodium dithiosulphatoargentate$(I)$. The reaction is: $AgBr + 2Na_2S_2O_3 	o Na_3[Ag(S_2O_3)_2] + NaBr$ This process removes the unexposed $AgBr$ from the film,making the image permanent.

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