JEE Main & Advanced Sample Paper JEE Main Sample Paper-47

  • question_answer
    Sodium thiosulphate, \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\cdot 5{{H}_{2}}O\] is used in photography to

    A)  reduce the silver bromide grains to metallic silver

    B)  convert the metallic silver to silver salt

    C)  remove un decomposed \[AgBr\] as soluble silver thiosulphate complex

    D)  remove reduced silver

    Correct Answer: C

    Solution :

     \[2N{{a}_{2}}{{S}_{2}}{{O}_{3}}+\underset{\text{Unexposed}}{\mathop{AgBr}}\,\xrightarrow{\,}\]\[N{{a}_{3}}Ag{{({{S}_{2}}{{O}_{3}})}_{2}}+NaBr\] The property is used for fixing in photography.

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