Which one of the following is paramagnetic

  • A

    $Zn^{2+}$

  • B

    $Ni^{2+}$

  • C

    $Cu^{+}$

  • D

    none of the above

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For the ions $Zn ^{2+}, \,Ni ^{2+}$ and $Cr ^{3+}$ which among the following statements is correct ?

(Atomic number of $Zn =30,\,Ni =28$ and $Cr =24$ )

  • [AIIMS 2019]

Besides $Zn$ and $Cu$, german silver contains the metal