EXERCISE-II (Previous Year Questions)

Which one of the following statements is CORRECT when ${\mathrm{SO}}_{\mathrm{2}}$ is passed through acidified ${\mathrm{K}}_{\mathrm{2}}{\mathrm{Cr}}_{\mathrm{2}}{\mathrm{O}}_{\mathrm{7}}$ solution?

Which of the following can convert ${\mathrm{Cl}}^{-}$ into ${\mathrm{Cl}}_2$ :-

The reason for the greater range of oxidation states in actinoids is attributed to _____.

The correct order of ionic radii of ${\mathrm{Y}}^{3+}, {\mathrm{La}}^{3+}, {\mathrm{Eu}}^{3+}, {\mathrm{Lu}}^{3+}$ is

The lanthanoid contraction is responsible for the fact that

Which of the following metal cation is reduced from its higher oxidation state $\left(+2\right)$ to $\left(+1\right)$ by both $\mathrm{Kl}$ solution and an excess of $\mathrm{KCN}$ solution?

A test tube containing a nitrate, and another containing a bromide and ${\mathrm{MnO}}_2$, are treated with concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$. The reddish brown fumes evolved are passed through water. The water will be coloured by: