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NEET Sample Paper NEET Sample Test Paper-40

  • question_answer
    Oxidation numbers of \[\text{P}\]in \[PO_{4}^{3-}\]of \[\text{S}\] in \[SO_{4}^{2-}\]and that of Cr in \[C{{r}_{2}}O_{7}^{2-}\]are respectively:

    A)  \[-3,+6\]and +6

    B)  \[+5,+3\]and +6

    C)  \[+3,+6\]and +5

    D)  +5, +6 and +6

    Correct Answer: D

    Solution :

     Oxidation no. in each case. \[PO_{4}^{3-}\] \[x+4(-2)=-3x=+5\] \[SO_{4}^{2-}\] \[x+(-2\times 4)=-2\] \[x-8=-2\] \[x=-2+8x=+6\] \[C{{r}_{2}}O_{7}^{2-}\] \[2x+(-2\times 7)=-2\] \[2x-14=-2\] \[2x=-2+14\] \[2x=12\] \[x=+6\]


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