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$\text{27) CaCl2+H2CO3$\rightarrow$CaCO3+2HCl}$

Tỉ lệ: $\text{1:1:1:2}$

$\text{28) 2NaOH+CuSO4$\rightarrow$Cu(OH)2+Na2SO4}$

Tỉ lệ: $\text{2:1:1:1}$

$\text{29) Zn+2HCl$\rightarrow$ZnCl2+H2}$

Tỉ lệ: $\text{1:2:1:1}$

$\text{30) 2Al+6HCl$\rightarrow$2AlCl3+3H2}$

Tỉ lệ: $\text{2:6:2:3}$

$\text{31) Fe+2HCl$\rightarrow$FeCl2+H2}$

Tỉ lệ: $\text{1:2:1:1}$

$\text{32) 2Al+3H2SO4$\rightarrow$Al2(SO4)3+3H2}$

Tỉ lệ: $\text{2:3:1:3}$

$\text{34) 2NaOH+CO2$\rightarrow$Na2CO3+H2O}$

Tỉ lệ: $\text{2:1:1:1}$

$\text{35) 6NaOH+P2O5$\rightarrow$2Na3PO4+3H2O}$

Tỉ lệ: $\text{6:1:2:3}$

$\text{36) Ca(OH)2+N2O5$\rightarrow$Ca(NO3)2+H2O}$

Tỉ lệ: $\text{1:1:1:1}$

$\text{37) 3Ca(OH)3+P2O5$\rightarrow$Na3PO4+3H2O}$

Tỉ lệ: $\text{3:1:1:3}$

$\text{38) 2NaOH+N2O5$\rightarrow$2NaNO3+H2O}$

Tỉ lệ: $\text{2:1:2:1}$

$\text{39) 2NaOH+SO3$\rightarrow$Na2SO4+H2O}$

Tỉ lệ: $\text{2:1:1:1}$

$\text{40) 2Fe+3Cl2$\xrightarrow{t^o}$2FeCl3}$

Tỉ lệ: $\text{2:3:2}$

Đáp án:

 

Giải thích các bước giải:

`(27)` không phản ứng.

`(28) 2NaOH + CuSO_4 -> Cu(OH)_2\downarrow + Na_2SO_4`

`(29) Zn + 2HCl -> ZnCl_2 + H_2\uparrow`

`(30) 2Al + 6HCl -> 2AlCl_3 + 3H_2\uparrow`

`(31) Fe + 2HCl -> FeCl_2 + H_2\uparrow`

`(32) 2Al + 3H_2SO_4 -> Al_2(SO_4)_3 + 3H_2\uparrow`

`(33) 2NaOH + CO_2 -> Na_2CO_3 + H_2O`

`(34) 6NaOH + P_2O_5 -> 2Na_3PO_4 + 3H_2O`

`(35) Ca(OH)_2 + N_2O_5 -> Ca(NO_3)_2 + H_2O`

`(36) P_2O_5 + Ca(OH)_2 -> Ca_3(PO_4)_2 + H_2O`

`(37) 2NaOH + N_2O_5 -> 2NaNO_3 + H_2O`

`(38) 2NaOH + SO_3 -> Na_2SO_4 + H_2O`

`(39) 2Fe + 3Cl_2 \overset{t^o}\to 2FeCl_3`