In photography,sodium thiosulphate is used as | vedclass

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(A) . In order to make the image permanent,it is necessary to remove the unreduced silver bromide from the surface of the developed film. This operati

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Complexing agent

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(A) . In order to make the image permanent,it is necessary to remove the unreduced silver bromide from the surface of the developed film. This operation is called fixing of the image. Fixing is done by dipping the developed film or plate in a sodium thiosulphate (hypo) solution. The hypo solution dissolves the unreduced silver bromide by forming a complex: $AgBr + 2Na_2S_2O_3 	o Na_3[Ag(S_2O_3)_2] + NaBr$. Thus,sodium thiosulphate acts as a complexing agent.

In photography,sodium thiosulphate is used as:

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