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KVPY Sample Paper KVPY Stream-SX Model Paper-28

  • question_answer
    A solution of \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] is standardized iodimetrically against 0.1262 g of \[KBr{{O}_{3}}.\]This process requires 456 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) 0.06 M

    D) 0.1 M

    Correct Answer: D

    Solution :

    \[N{{a}_{2}}{{\overset{2+}{\mathop{S}}\,}_{2}}{{O}_{3}}+K\overset{+5}{\mathop{B}}\,r{{O}_{3}}\to B{{r}^{-}}+N{{a}_{2}}{{\overset{+2.5}{\mathop{S}}\,}_{4}}{{O}_{6}}\]
    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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