A) \[CaO+C{{O}_{2}}\to CaC{{O}_{3}}\]
B) \[4Na+{{O}_{2}}\to 2N{{a}_{2}}O\]
C) \[2S{{O}_{2}}+{{O}_{2}}\to 2S{{O}_{3}}\]
D) \[N{{H}_{3}}+HCl\to N{{H}_{4}}Cl\]
Correct Answer: B
Solution :
Both Na and \[{{O}_{2}}\] are elements.
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