NEET Sample Paper NEET Sample Test Paper-45

  • question_answer
    In the reaction, \[H{{g}_{2}}S+Mn{{O}_{4}}^{-}+{{H}^{+}}\to H{{g}^{2+}}+S{{O}^{2-}}_{4}+M{{n}^{2+}}+{{H}_{2}}O\] the n-factor for \[H{{g}_{2}}S\] will be same as during conversion of-

    A) \[{{N}_{2}}\,to\text{ }N{{O}_{2}}\]                 

    B) \[{{N}_{2}}{{H}_{4}}to\text{ }{{N}_{2}}{{O}_{3}}\]

    C) \[NO\text{ }to\,HN{{O}_{3}}\]  

    D) \[N{{H}_{3\,}}to\text{ }NO\]

    Correct Answer: B

    Solution :

    \[\overset{(+1)}{\mathop{H{{g}_{2}}}}\,\,\,\overset{(-2)}{\mathop{S}}\,\,\,\,\to \,\,H{{g}^{+\,2}}+{{\overset{(+\,6)}{\mathop{S{{O}^{-2}}}}\,}_{4}}\]\ \[n-factor\,\,\,\to \,\,H{{g}^{+2}}=\left( +1\text{ }to+2 \right)\times 2\] \[=\text{ }2e{{\,}^{-}}loss\] \[S=\left( -2\text{ }to+6 \right)=8e{{\,}^{-}}loss\] \[n-factor\text{ }=10\] Also, \[\overset{(-2)}{\mathop{{{N}_{2}}{{H}_{4}}}}\,\,\,\to \,\,\overset{(+3)}{\mathop{{{N}_{2}}{{O}_{3}}}}\,\] n-factor \[=\,\,\left( -2\text{ }to+3 \right)\times 2=10\text{ }e{{\,}^{-}}loss\]


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