Which of the following pairs has similar ionic radii?
- A$Zn^{2+}, Hf^{4+}$
- B$Fe^{2+}, Ni^{2+}$
- C$Zr^{4+}, Ti^{4+}$
- D$Zr^{4+}, Hf^{4+}$
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Statement $I :$ The $E^{\circ}$ value of $Ce^{4+} / Ce^{3+}$ is $+1.74 \, V$.
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