Redox Reactions · JEE Advanced previous year questions

2024 2 questions

1. Q362024 · 26 May 2024 · Paper 1

   At room temperature, disproportionation of an aqueous solution of \textit{in situ} generated nitrous acid ($\mathrm{HN}{\mathrm{O}}_2$) gives the species

   1. A.${\mathrm{H}}_3{\mathrm{O}}^{+}$, $\mathrm{N}{\mathrm{O}}_3^{-}$ and $\mathrm{NO}$
   2. B.${\mathrm{H}}_3{\mathrm{O}}^{+}$, $\mathrm{N}{\mathrm{O}}_3^{-}$ and $\mathrm{N}{\mathrm{O}}_2$
   3. C.${\mathrm{H}}_3{\mathrm{O}}^{+}$, $\mathrm{N}{\mathrm{O}}^{-}$ and $\mathrm{N}{\mathrm{O}}_2$
   4. D.${\mathrm{H}}_3{\mathrm{O}}^{+}$, $\mathrm{N}{\mathrm{O}}_3^{-}$ and ${\mathrm{N}}_2\mathrm{O}$
   Show answer

   Answer: A

2. Q362024 · 26 May 2024 · Paper 2

   In a metal deficient oxide sample, ${\mathrm{M}}_{\mathrm{X}}{\mathrm{Y}}_2{\mathrm{O}}_4$ ($\mathbf{M}$ and $\mathbf{Y}$ are metals), $\mathbf{M}$ is present in both +2 and +3 oxidation states and $\mathbf{Y}$ is in +3 oxidation state. If the fraction of ${\mathrm{M}}^{2+}$ ions present in $\mathbf{M}$ is $\frac{1}{3}$, the value of $\mathbf{X}$ is ____.

   1. A.0.25
   2. B.0.33
   3. C.0.67
   4. D.0.75
   Show answer

   Answer: D