A) \[HN{{O}_{3}}\]
B) \[Na\]
C) \[C{{l}_{2}}\]
D) \[Cr\]
Correct Answer: B
Solution :
Elements of \[IA\] group (i.e., alkali metals) are well known reducing agents. Among the given elements \[Na\] is the only element of \[IA\] group, hence, is most reducing agent.
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