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NEET Sample Paper NEET Sample Test Paper-6

  • question_answer
    One mole of acidified \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] on reaction with excess \[KI\] will liberate .... mole of \[{{I}_{2}}\]:

    A)  6                    

    B)  1

    C)  3                    

    D)  2

    Correct Answer: C

    Solution :

    \[C{{r}_{2}}O_{7}^{2-}+14{{H}^{+}}+6{{e}^{-}}\xrightarrow{{}}2C{{r}^{3+}}+7{{H}_{2}}O\] \[\underset{C{{r}_{2}}O_{7}^{2-}+14{{H}^{+}}+6{{I}^{-}}\xrightarrow{{}}2C{{r}^{3+}}+7{{H}_{2}}O+3{{I}_{2}}}{\mathop{\underset{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}{\mathop{\left( 2{{I}^{-}}\xrightarrow{{}}{{I}_{2}}+2{{e}^{-}} \right)\times 3}}\,}}\,\] Hence, number of moles of \[{{I}_{2}}\] liberated = 3


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