A) \[Na\]
B) \[Ca\]
C) \[K\]
D) \[-Zn\]
Correct Answer: D
Solution :
Moderately active metals which are more electropositive than iron, are used for coating iron or steel articles to prevent them from corrosion. Among the given metal, Zn is moderately active and more electropositive than iron, hence it is used for coating steel.
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