JEE Main & Advanced Chemistry Alkali Metals Question Bank Alkali Metals

  • question_answer Sodium thiosulphate is used in photography [UPSEAT 1999]

    A) To convert metallic silver into silver salt

    B) AgBr grain is reduced to non-metallic silver

    C) To remove reduced silver

    D) To remove undecomposed AgBr in the form of \[N{{a}_{3}}[Ag{{[{{S}_{2}}{{O}_{3}})}_{2}}]\] (a complex salt)

    Correct Answer: A

    Solution :

    Sodium thiosulphate is a reducing agent which convert metalic silver into silver salt.


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