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KVPY Sample Paper KVPY Stream-SX Model Paper-14

  • question_answer
    A solution \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] is standardized iodimetrically against 0.1262 g of \[KBr{{O}_{3}}.\] this process requires 45 mL of the \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] solution. What is the molarity of the \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\]?

    A) 0.2 M

    B) 0.5 M

    C) 0.05 M

    D) 0.1 M

    Correct Answer: D

    Solution :

    \[N{{a}_{2}}\overset{2+}{\mathop{{{S}_{2}}}}\,{{O}_{3}}+K\overset{+5}{\mathop{B}}\,e{{O}_{3}}\xrightarrow{{}}B{{r}^{-}}+N{{a}_{2}}\overset{+\,2.5}{\mathop{{{S}_{4}}}}\,{{O}_{6}}\] \[v.f=1\]                        \[v.f=6\] By m. e. of \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}=m.e.\] of \[KBr{{O}_{3}}\] Molarity of \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}=0.1\,M\]


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