MCQ
The highest oxidation state shown by transition elements is
- A$+ 7$ by $Mn$
- B$+ 8$ by $Os$
- C$+ 8$ by $Ru$
- ✓Both $(b)$ and $(c)$
Hence Options $\mathrm{B} \& \mathrm{C}$ are correct.
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$A + 2B \rightleftharpoons 2C + D$
(Rounded off to the nearest integer) [Given : Atomic weight in $g\, mol ^{-1}- Na : 23$; $N : 14 ; O : 16]$
Statement I: Both $\left[\mathrm{Co}\left(\mathrm{NH}_3\right) 6\right]^{3+}$ and $\left[\mathrm{CoF}_6\right]^3$ complexes are octahedral but differ in their magnetic behaviour.
Statement II: $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)\right]^{3+}$ is diamagnetic whereas $\left[\mathrm{CoF} \mathrm{F}_6\right]^{3-}$ is paramagnetic.
In the light of the above statements, choose the correct answer from the options given below: