MCQ
The maximum and minimum melting point of first and second transition series elements respectively are obtained with
- A$Cr$ and $Zn$
- B$Cr$ and $Hg$
- ✓$Cr$ and $Cd$
- D$Mo$ and $Cd$
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Reason : Cuprous ion $(Cu^+)$ is colourless whereas cupric ion $(Cu^{2+})$ is blue in the aqueous solution.
Reason $(R)$: $\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}$complex ion has an octahedral geometry.
In the light of the above statements, choose the most appropriate answer from the options given below :