$3d-$ metal ions exhibit paramagnetic behavior because . . . . .

  • A
    Variable oxidation states
  • B
    High electronegativity
  • C
    High charge/size ratio and empty $d-$ orbitals
  • D
    They contain one or more unpaired electrons

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Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are

In which one of the following pairs,both the elements do not have $(n-1)d^{10}ns^2$ configuration in their elementary state?

Which of the following ions is diamagnetic?

Assertion: Cuprous ion $(Cu^{+})$ has unpaired electrons while cupric ion $(Cu^{2+})$ does not.
Reason: Cuprous ion $(Cu^{+})$ is colourless whereas cupric ion $(Cu^{2+})$ is blue in the aqueous solution.

The basic character of the transition metal monoxides follows the order
(Atomic no. $Ti = 22, V = 23, Cr = 24, Fe = 26$)

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