Biomolecules · JEE Advanced previous year questions

2023 1 question

1. Q382023 · 4 Jun 2023 · Paper 1

   In the scheme given below, $\mathbf{X}$ and $\mathbf{Y}$, respectively, are $$\text{Metal halide}\stackrel{aq.\mathrm{NaOH}}{\to }\text{White precipitate }(\mathbf{P})+\text{Filtrate }(\mathbf{Q})$$ $$\mathbf{P}\underset{\mathrm{heat}}{\overset{\begin{array}{c}aq.{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4,\\ \mathrm{Pb}{\mathrm{O}}_2(\mathrm{excess})\end{array}}{\to }}\mathbf{X}\text{(a coloured species in solution)}$$ $$\mathbf{Q}\underset{\mathrm{warm}}{\overset{\begin{array}{c}\mathrm{MnO}(\mathrm{OH}{)}_2,\\ Conc.{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4\end{array}}{\to }}\mathbf{Y}\text{(gives blue-coloration with KI-starch paper)}$$

   1. A.$\mathrm{Cr}{\mathrm{O}}_4^{2-}$ and $\mathrm{B}{\mathrm{r}}_2$
   2. B.$\mathrm{Mn}{\mathrm{O}}_4^{2-}$ and $\mathrm{C}{\mathrm{l}}_2$
   3. C.$\mathrm{Mn}{\mathrm{O}}_4^{-}$ and $\mathrm{C}{\mathrm{l}}_2$
   4. D.$\mathrm{MnS}{\mathrm{O}}_4$ and $\mathrm{HOCl}$
   Show answer

   Answer: C