Redox Reactions · JEE Main previous year questions

2012 2 questions

1. Q772012 · 26 May 2012 · Shift 1

   Which of the following forms stable $+4$ oxidation state?

   1. A.$\mathrm{La}(Z=57)$
   2. B.$\mathrm{Eu}(Z=63)$
   3. C.$\mathrm{Ce}(Z=58)$
   4. D.$\mathrm{Gd}(Z=64)$
   Show answer

   Answer: C

2. Q712012 · 12 May 2012 · Shift 1

   In the following balanced reaction, $X\mathrm{Mn}{\mathrm{O}}_4^{-}+Y{\mathrm{C}}_2{\mathrm{O}}_4^{2-}+Z{\mathrm{H}}^{+}\rightleftharpoons X\mathrm{M}{\mathrm{n}}^{2+}+2Y\mathrm{C}{\mathrm{O}}_2+\frac{Z}{2}{\mathrm{H}}_2\mathrm{O}$ values of $X,Y$ and $Z$ respectively are

   1. A.$2,5,16$
   2. B.$8,2,5$
   3. C.$5,2,16$
   4. D.$5,8,4$
   Show answer

   Answer: A