Predict the missing component of each reaction.
? + 2 upper Na upper Br right arrow 2 upper Na upper Cl plus upper Br subscript 2.
A. HCl
B. Cl2
C. Na

Upper Mg plus. ? right arrow upper Mg upper O plus upper H subscript 2.
A. Mg(OH)2
B. O2
C. H2O

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