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Q.

In photography silver bromide dissolves in hypo to give

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a

Na4[Ag(S2O3)2]

b

Na3[Ag(S2O3)2]

c

Na[Ag(S2O3)2]

d

Na2[Ag(S2O3)2]

answer is C.

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Detailed Solution

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  • After the developing, the sensitive emulsion of silver bromide is still present on the plate in the parts unaffected by light. 
  • Therefore, it is necessary to remove it in order to get the permanent image. 
  • This process is called fixing of image. 
  • The negative plate after washing is dipped in a fixing solution of sodium thiosulphate (hypo). 
  • It dissolves unaffected silver bromide but leaves metallic silver unaffected.
    2Na2​S2​O3​+AgBr⟶Na3​[Ag(S2​O3​)2​]+NaBr
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