A) \[C{{r}_{2}}{{O}_{3}}.\ 2{{H}_{2}}O\]
B) \[Fe{{O}_{3}}.2{{H}_{2}}O\]
C) \[C{{u}_{2}}{{O}_{3}}\]
D) \[FeC{{O}_{3}}.C{{r}_{2}}{{O}_{3}}\]
E) \[FeO\ .\ C{{r}_{2}}{{O}_{3}}\]
Correct Answer: A
Solution :
\[C{{r}_{2}}{{O}_{3}}.2{{H}_{2}}O\] is known as cruignet green.
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