a) Mg + 2HClO4 ----> Mg(ClO4)2 + H2 MgO + 2HClO4 ----> Mg(ClO4)2 + H2O Mg(OH)2 + 2HClO4 ----> Mg(ClO4)2 + 2H2O b) 2Na + H2S ----> Na2S + H2 Na2O + H2S ----> Na2S + H2O 2NaOH + H2S ----> Na2S + 2H2O
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a)
Mg + 2HClO4 ----> Mg(ClO4)2 + H2
MgO + 2HClO4 ----> Mg(ClO4)2 + H2O
Mg(OH)2 + 2HClO4 ----> Mg(ClO4)2 + 2H2O
b)
2Na + H2S ----> Na2S + H2
Na2O + H2S ----> Na2S + H2O
2NaOH + H2S ----> Na2S + 2H2O