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NEET Chemistry Structure of Atom / परमाणु संरचना NEET PYQ-Structure of Atom

  • question_answer
    Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code:                                                                                   [NEET - 2018]
    Column I Column II
    a. \[\text{C}{{\text{o}}^{\text{3+}}}\] i. \[\sqrt{\text{8}}\text{ BM}\]
    b. \[\text{C}{{\text{r}}^{\text{3+}}}\] ii. \[\sqrt{35}\text{ }BM\]
    c. \[\text{F}{{\text{e}}^{\text{3+}}}\] iii. \[\sqrt{3}\text{ }BM\]
    d. \[\text{N}{{\text{i}}^{\text{2+}}}\] iv. \[\sqrt{24}\text{ }BM\]
    v. \[\sqrt{15}\text{ }BM\]

    A) a-iv      b-i        c-ii       d-iii

    B) a-I        b-ii       c-iii      d-iv

    C) a-iv      b-v       c-ii       d-i

    D) a-iii      b-v       c-I        d-ii

    Correct Answer: C

    Solution :

    [c] \[\text{C}{{\text{o}}^{\text{3+}}}\text{= }\!\![\!\!\text{ Ar }\!\!]\!\!\text{ 3}{{\text{d}}^{\text{6}}}\], Unpaired\[{{\text{e}}^{\text{--}}}\text{(n)=4}\]
    Spin magnetic moment \[\text{=}\sqrt{4(4+2)}=\sqrt{24}\text{BM}\]
    \[\text{C}{{\text{r}}^{\text{3+}}}\text{= }\!\![\!\!\text{ Ar }\!\!]\!\!\text{ 3}{{\text{d}}^{\text{3}}}\text{,}\] Unpaired \[{{\text{e}}^{\text{-}}}\text{(n)=3}\]
    Spin magnetic moment\[\text{=}\sqrt{3(3+2)}=\sqrt{15}\text{BM}\]
    \[F{{e}^{3}}+=[Ar]3{{d}^{5}}\], Unpaired\[{{e}^{}}(n)=5\]
    Spin magnetic moment\[=\sqrt{5(5+2)}=\sqrt{35}\text{BM}\]
    \[\text{N}{{\text{i}}^{\text{2+}}}\text{= }\!\![\!\!\text{ Ar }\!\!]\!\!\text{ 3}{{\text{d}}^{\text{8}}}\text{,}\] Unpaired \[{{e}^{-}}(n)=2\]
    Spin magnetic moment \[=\sqrt{2(2+2)}=\sqrt{8}\text{BM}\]


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