A) \[C{{a}_{2}}\]
B) \[A{{l}_{3}}\]
C) \[N{{i}_{2+}}\]
D) \[M{{g}_{3+}}\]
Correct Answer: C
Solution :
Some minerals are either components of enzymes, their cofactors or activators. e.g.,\[N{{i}_{2+}}\]
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