A) \[CaO+C{{O}_{2}}\to CaC{{O}_{3}}\]
B) \[4Na+{{O}_{2}}\to 2N{{a}_{2}}O\]
C) \[S{{O}_{2}}+\frac{1}{2}{{O}_{2}}\to S{{O}_{3}}\]
D) \[N{{H}_{3}}+HCl\to N{{H}_{4}}Cl\]
Correct Answer: B
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