A) \[Fe\]
B) \[Zn\]
C) \[K\]
D) \[Ca\]
Correct Answer: A
Solution :
A binary compound is that compound which is formed by two different elements. Metals or elements which shows variable oxidation states can form more than one binary compound. In the given compound Fe shows +2 and +3 oxidation states. So, it can form two binary compounds with chlorine as\[FeC{{l}_{2}}\] and \[FeC{{l}_{3}}\].
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