Which of the following statements is correct | vedclass

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Question

(A) The electronic configurations are as follows:$Zn^{2+} (Z=30): [Ar] 3d^{10} 4s^0$. It has no unpaired electrons,so it is colourless.$Ni^{2+} (Z=28)

Vedclass · Accepted Answer

Only $Zn^{2+}$ is colourless and $Ni^{2+}$ and $Cr^{3+}$ are coloured

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(A) The electronic configurations are as follows:$Zn^{2+} (Z=30): [Ar] 3d^{10} 4s^0$. It has no unpaired electrons,so it is colourless.$Ni^{2+} (Z=28): [Ar] 3d^8 4s^0$. It has two unpaired electrons,so it is coloured.$Cr^{3+} (Z=24): [Ar] 3d^3 4s^0$. It has three unpaired electrons,so it is coloured.Therefore,only $Zn^{2+}$ is colourless,while $Ni^{2+}$ and $Cr^{3+}$ are coloured.

Which of the following statements is correct regarding the ions $Zn^{2+}$,$Ni^{2+}$,and $Cr^{3+}$? (Atomic numbers: $Zn = 30$,$Ni = 28$,$Cr = 24$)

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