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Đáp án+Giải thích các bước giải:

$\bullet$ 1)

`@` $Ca$ $\xrightarrow{1}$ $CaO$ $\xrightarrow{2}$ $Ca(OH)_2$ $\xrightarrow{3}$ $CaCO_3$ $\xrightarrow{4}$ $CO_2$

1) $2Ca+O_2$ $\xrightarrow{t^o}$ $2CaO$
2) $CaO+H_2O$ $\rightarrow$ $Ca(OH)_2$

3) $Ca(OH)_2+CO_2$ $\rightarrow$ $CaCO_3↓+H_2O$

4) $CaCO_3$ $\xrightarrow{t^o}$ $CaO+CO_2↑$

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$\bullet$ 2)

`@` $Ba$ $\xrightarrow{1}$ $BaO$ $\xrightarrow{2}$ $Ba(OH)_2$ $\xrightarrow{3}$ $BaCO_3$ $\xrightarrow{4}$ $CO_2$

1) $2Ba+O_2$ $\xrightarrow{t^o}$ $2BaO$

2) $BaO+H_2O$ $\rightarrow$ $Ba(OH)_2$

3) $Ba(OH)_2+CO_2$ $\rightarrow$ $BaCO_3↓+H_2O$

4) $BaCO_3+2HCl$ $\rightarrow$ $BaCl_2+H_2O+CO_2↑$

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$\bullet$ 3)

`@` $Na$ $\xrightarrow{1}$ $Na_2O$ $\xrightarrow{2}$ $NaOH$ $\xrightarrow{3}$ $Cu(OH)_2$ $\xrightarrow{4}$ $CuO$ 

1) $4Na+O_2$ $\xrightarrow{t^o}$ $2Na_2O$

2) $Na_2O+H_2O$ $\rightarrow$ $2NaOH$

3) $2NaOH+CuSO_4$ $\rightarrow$ $Na_2SO_4+Cu(OH)_2↓$

4) $Cu(OH)_2$ $\xrightarrow{t^o}$ $CuO+H_2O$

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$\bullet$ 4)

`@` $FeO$ $\xrightarrow{1}$ $Fe$ $\xrightarrow{2}$ $FeCl_2$ $\xrightarrow{3}$ $Fe(OH)_2$ $\xrightarrow{4}$ $FeSO_4$

1) $FeO+H_2$ $\xrightarrow{t^o}$ $Fe+H_2O$

2) $Fe+2HCl$ $\rightarrow$ $FeCl_2+H_2$

3) $FeCl_2+2NaOH$ $\rightarrow$ $2NaCl+Fe(OH)_2↓$

4) $Fe(OH)_2+H_2SO_4$ $\rightarrow$ $FeSO_4+2H_2O$

Đáp án + Giải thích các bước giải:

$2Ca+O_2\xrightarrow{t^o}2CaO$

$CaO+H_2O\to Ca(OH)_2$

$Ca(OH)_2+CO_2\to CaCO_3↓+H_2O$

$CaCO_3\xrightarrow{t^o}CaO+CO_2↑$

$$---------------------$$

$2Ba+O_2\xrightarrow{t^o}2BaO$

$BaO+H_2O\to Ba(OH)_2$

$Ba(OH)_2+CO_2\to BaCO_3↓+H_2O$

$BaCO_3\xrightarrow{t^o}BaO+CO_2↑$

$$---------------------$$

$4Na+O_2\xrightarrow{t^o}2Na_2O$

$Na_2O+H_2O\to 2NaOH$

$2NaOH+CuCl_2\to Cu(OH)_2↓+2NaCl$

$2Cu(OH)_2\xrightarrow{t^o}CuO+H_2O$

$$---------------------$$

$FeO+H_2\xrightarrow{t^o}Fe+H_2O$

$Fe+2HCl\to FeCl_2+H_2↑$

$FeCl_2+2NaOH\to Fe(OH)_2↓+2NaCl$

$Fe(OH)_2+H_2SO_4\to FeSO_4+2H_2O$