Guignet's green is known as
- A$Cr_2O_3 \cdot 2H_2O$
- B$Fe_2O_3 \cdot 2H_2O$
- C$Cu_2O_3$
- D$FeCO_3 \cdot Cr_2O_3$
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$Fe_2Cr_2O_4 + Na_2CO_3 + O_2$ $\xrightarrow{\text{Fusion}} [X]$ $\xrightarrow[H_2O]{H^{+}} [Y]$ $\xrightarrow{H_2O_2/H^{+}} [Z]$
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