Pair of transition metal ions having the same number of unpaired electrons is $:$

  • A
    $V^{2+}, Co^{2+}$
  • B
    $Ti^{2+}, Co^{2+}$
  • C
    $Fe^{3+}, Cr^{2+}$
  • D
    $Ti^{3+}, Mn^{2+}$

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For what reason is the element $Th$ included in the $f$-block?

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Reason $(R)$: $3d$-electrons experience lesser shielding than $4f$-electrons.

Although $Zr$ belongs to the $4d$ transition series and $Hf$ belongs to the $5d$ transition series,it is quite difficult to separate them. Why?

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Which of the following pairs exhibit color in aqueous medium?

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