[Kerala PMT 2004]
A) $ Cr_2O_3.\ 2H_2O $
B) $ FeO_3.2H_2O $
C) $ Cu_2O_3 $
D) $ FeCO_3.Cr_2O_3 $
E) $ FeO\ .\ Cr_2O_3 $
Correct Answer: A
$ Cr_2O_3.2H_2O $ is known as guignet green.
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