MCQ
In $C{H_3}C{H_2}OH\mathop {\xrightarrow{X}}\limits_{{{350}\,^o}C} C{H_2} = C{H_2} + {H_2}O;$ $'X' $ is
- A$NaCl$
- B$CaC{l_2}$
- C${P_2}{O_5}$
- ✓$A{l_2}{O_3}$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

$(I)$ $CrO_4^{2-}$
$(II)$ $MnO_4^-$
$(III)$ $Cr_2O_7^{2-}$ ?