Which of the following is paramagnetic

  • A

    $N{i^{ + 2 }}$

  • B

    $C{u^ + }$

  • C

    $Z{n^{ + 2 }}$

  • D

    $S{c^{ + 3 }}$

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  • [JEE MAIN 2020]

Amongst $TiF_6^{2 - },CoF_6^{3 - },C{u_2}C{l_2}$ and $NiCl_4^{2 - }$ (Atomic number $Ti = 22,$ $Co = 27,$ $Cu = 29,$ $Ni = 28$). The colourless species are

  • [AIPMT 1995]

Magnetic moment is expressed in