11th Class Chemistry Alkali Metals Question Bank Alkali Metals

  • question_answer Sodium thiosulphate \[(N{{a}_{2}}{{S}_{2}}{{O}_{3}}.5{{H}_{2}}O)\] is used in photography to [CPMT 1972, 74, 79; DPMT 1983; Bihar CEE 1995; MNR 1995]

    A) Reduce silver bromide to metallic silver

    B) Convert metallic silver to silver salt

    C) Remove undecomposed \[AgBr\]as a soluble silver thisulphate complex

    D) Remove unreduced silver

    Correct Answer: C

    Solution :

    \[AgBr+2N{{a}_{2}}{{S}_{2}}{{O}_{3}}\to N{{a}_{3}}[Ag{{({{S}_{2}}{{O}_{3}})}_{2}}]+NaBr\]

adversite


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