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?$ \ \text {Mg+2HCl}\xlongequal[\ \ \ \ \ \ ]{}\ \text {MgCl}_2+\ \text {H}_2↑$?
?$ \ \text {CaCO}_3+2\ \text {HCl}\xlongequal[\ \ \ \ \ \ ]{\ \ \ \ \ \ }\ \text {CaCl}_2+$?
?$ \ \text {H}_2\ \text {O}+\ \text {CO}_2↑($?復分解反應)
?$ \ \text {Fe+H}_2\ \text {SO}_4\xlongequal[\ \ \ \ \ \ ]{}\ \text {FeSO}_4+\ \text {H}_2↑$?
?$ \ \text {Fe}_2\ \text {O}_3+\ \text {6HCl}\xlongequal[\ \ \ \ \ \ ]{}\ \text {2FeCl}_3+3\ \text {H}_2\ \text {O}($?復分解反應)
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