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NEET Sample Paper NEET Sample Test Paper-59

  • question_answer
    Number of moles of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\], reduced by one mole of \[S{{n}^{2+}}\] ions is:

    A) 1/3                               

    B) 3      

    C) 1/6                               

    D) 6

    Correct Answer: B

    Solution :

    [a] 1/3 It oxidizes stannous salt to stannic salt \[S{{n}^{2+}}\xrightarrow{{}}\,S{{n}^{4+}}+2{{e}^{-}}]\times 3\] \[C{{r}_{2}}O_{7}^{2-}+14{{H}^{+}}+6{{e}^{-}}\xrightarrow{{}}2C{{r}^{3+}}+7{{H}_{2}}O\] \[3S{{n}^{2+}}+C{{r}_{2}}O_{7}^{2-}+14{{H}^{+}}\] \[\xrightarrow{{}}3S{{n}^{2+}}+C{{r}_{2}}O_{7}^{2-}+14{{H}^{+}}\] \[\frac{1}{3}\,\,mole\,of\,{{K}_{2}}\,C{{r}_{2}}{{O}_{7}}\,\,is\,reduced\]


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