Redox Reactions · JEE Main previous year questions

2018 2 questions

1. Q692018 · 16 Apr 2018 · Shift 1

   When $\mathrm{X}{\mathrm{O}}_2$ is fused with an alkali metal hydroxide in presence of an oxidizing agent such as $\mathrm{KN}{\mathrm{O}}_3$ ; a dark green product is formed which disproportionates in acidic solution to afford a dark purple solution. $\mathrm{X}$ is :

   1. A.$\mathrm{Ti}$
   2. B.$\mathrm{V}$
   3. C.$\mathrm{Cr}$
   4. D.$\mathrm{Mn}$
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   Answer: D

2. Q752018 · 8 Apr 2018 · Shift 1

   The oxidation states of Cr in $[\text{Cr}({\text{H}}_2\text{O}{)}_6]{\text{Cl}}_3$, $[\text{Cr}({\text{C}}_6{\text{H}}_6{)}_2]$ and ${\text{K}}_2[\text{Cr}(\text{CN}{)}_2(\text{O}{)}_2({\text{O}}_2)({\text{NH}}_3)]$ respectively are :

   1. A.+3, 0 and +4
   2. B.+3, +4 and +6
   3. C.+3, +2 and +4
   4. D.+3, 0 and +6
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   Answer: D