Transition elements are coloured

  • A

    Due to small size

  • B

    Due to metallic nature

  • C

    Due to unpaired $d -$  electrons

  • D

    All of these

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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]

Electrons in a paramagnetic compound are