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B
C
D
C
$ \ \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↑($复分解反应)
$ \ \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}($复分解反应)
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