MCQ
Which one of the following oxides is ionic
- ✓$MnO$
- B$M{n_2}{O_7}$
- C$Cr{O_3}$
- D${P_2}{O_5}$
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$C$ is

Roasted gold ore $+CN^-+ H_2O \xrightarrow{{{O_2}}} [x] + OH^-;$ $[x] + Zn \rightarrow [y] + Au$
$[x]$ and $[y]$ are :