Write the reaction equation: Ca → CaH2 → Ca (OH) 2 → CaCO3 → CaO → Ca (NO3) 2 → Ca (NO2) 2 → CaCl2 → Ca → CaH2 → CaCl2

1 Ca+H2=CaH2
2 CaH2+2H2O=Ca(OH)2+2H2
3 Ca(OH)2+Na2CO3=2NaOH+CaCO3
4 CaCO3=CaO+CO2
5 CaO+2HNO3=Ca(NO3)2+H2O
6 Ca(NO3)2=Ca(NO2)2+O2
7 Ca(NO2)2+2HCl=CaCl2+2HNO2
8 CaCl2=Ca+Cl2
9 Ca+H2=CaH2
10 CaH2+2HCl=CaCl2+2H2



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