Ca+2H2O→Ca(OH)2+H2
Zn+CuSO4→ZnSO4+Cu
WO3+3H2→W+3H2O
Cr2O3+2Al→2Cr+Al2O3
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Ca+2H2O→Ca(OH)2+H2
Zn+CuSO4→ZnSO4+Cu
WO3+3H2→W+3H2O
Cr2O3+2Al→2Cr+Al2O3