MCQ
Which of the following is correctly matched?
- A$[Cu(NH_3)_4]^{2+}$ Diamagnetic
- B$[Ni(CN)_4]^{2-}$ Paramagnetic
- C$[MnCl_4]^{2-}$ Diamagnetic
- ✓$[Fe(CN)_6]^{4-}$ Diamagnetic
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$(I)$ the nature of the ligand
$(II)$ the charge on the metal ion
$(III)$ whether the metal is in the first, second or third row of the transition elements

On addition of equal number of moles of a non-volatile solute $S$ in equal amount (in $kg$ ) of these solvents, the elevation of boiling point of solvent $X$ is three times that of solvent $Y$. Solute $S$ is known to undergo dimerization in these solvents. If the degree of dimerization is $0.7$ in solvent $Y$, the degree of dimerization in solvent $X$ is. . . . . . .
Product $(B)$ is