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NEET Sample Paper NEET Sample Test Paper-68

  • question_answer
    The equivalent weight of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] in acidic medium

    A) 294                              

    B) 49

    C) 298                              

    D) 50

    Correct Answer: B

    Solution :

    \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\,\,\to \,\,3{{H}_{2}}S{{O}_{4}}\,\,\to \,\,{{K}_{2}}S{{O}_{4}}\,\,+\,\,C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\] \[+\,3\left( O \right)+3{{H}_{2}}\] No. of electrons lost \[=\,\,12-6=6\] \[\Rightarrow \ \ Equivalent\,\,weight\,\,=\,\,\frac{M}{6}=\frac{294}{6}=49\]


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