MCQ
The catalyst used in making $\mathrm{H}_2 \mathrm{SO}_4$ in contact process is:
- ✓$ \mathrm{V}_2 \mathrm{O}_5 $
- B$ \mathrm{Fe}_2 \mathrm{O}_3 $
- C$ \mathrm{Cr}_2 \mathrm{O}_3 $
- D$ \mathrm{CrO}_3 $
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${B^{3 + }}_{(aq.)} + 3{e^ - } \to B(s)$ ; $E = 0.6\ Volt$
Using above information find the ion which will be deposited first at cathode if solution containing $A_{(aq.)}^{2 + }$ & $B_{(aq.)}^{ 3+ }$ is electrolysed
(take $K_b = 0.76\, K \,kg \,mol^{-1}$)
${\left( {I} \right)}$ ${{C_6}{H_5}COC{H_3}}$
${\left( {II} \right)}$ ${C{H_3}COC{H_3}}$
${\left( {III} \right)}$ ${C{H_3} - CHO}$