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VMMC VMMC Medical Solved Paper-2015

  • question_answer
    Oxidation    number    of    P    in \[{{H}_{4}}{{P}_{2}}{{O}_{5}},{{H}_{4}}{{P}_{2}}{{O}_{6}},{{H}_{4}}{{P}_{2}}{{O}_{7}}\]respectively are

    A) + 3, + 5, + 4                        

    B) + 4, + 3, + 5

    C) + 3, + 4, + 5                        

    D)  + 5, + 3, + 4

    Correct Answer: C

    Solution :

    \[{{H}_{4}}{{P}_{2}}{{O}_{6}}=4\times 1+2\times a-5\times 2=0\] \[a=+3\] \[{{H}_{4}}{{P}_{2}}{{O}_{6}}=4\times 1+2\times a-6\times 2=0\] \[a=+4\] \[{{H}_{4}}{{P}_{2}}{{O}_{7}}=4\times 1+2\times a-7\times 2=0\] \[a=+5\]


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