MCQ
The lanthanide contraction is responsible for the fact that
- A$Zr$ and $Y$ have about the same radius
- B$Zr$ and $Nb$ have similar oxidation state
- ✓$Zr$ and $Hf$ have about the same radius
- D$Zr$ and $Zn$ have the same oxidation sate
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$E^o_{Fe^{3+} /Fe} = -0.036\,V,$ $E^o _{Fe^{2+} /Fe} = -0.439\,V$
The value of standard electrode potential for the change,
$Fe^{3+} (aq) + e^- \rightarrow Fe^{2+} (aq)$ will be ........ $V$.
$(A)$ Number of lone pairs on oxygen is 2 .
$(B)$ $FOF$ angle is less than $104.5^{\circ}$.
$(C)$ Oxidation state of $O$ is $-2$.
$(D)$ Molecule is bent ' $V$ ' shaped.
$(E)$ Molecular geometry is linear.
Correct options are: