Đáp án:
Giải thích các bước giải:
\(\begin{array}{l} a,\ Zn+H_2SO_4\to ZnSO_4+H_2S\uparrow+H_2O\\ Zn^0-2e\to Zn^{+2}\ \ \ \ \ \ \ \times 4\\ S^{+6}+8e\to S^{-2}\ \ \ \ \ \ \ \ \ \ \times 1\\ \Rightarrow PTHH:4Zn+5H_2SO_4\to 4ZnSO_4+H_2S\uparrow+4H_2O\\ b,\ Zn+H_2SO_4\to ZnSO_4+S\downarrow+H_2O\\ Zn^0-2e\to Zn^{+2}\ \ \ \ \ \ \ \ \ \times 3\\ S^{+6}+6e\to S^0\ \ \ \ \ \ \ \ \ \ \ \ \ \ \times 1\\ \Rightarrow PTHH:3Zn+4H_2SO_4\to 3ZnSO_4+S\downarrow+4H_2O\\ c,\ Zn+H_2SO_4\to ZnSO_4+SO_2\uparrow+H_2O\\ Zn^0-2e\to Zn^{+2}\ \ \ \ \ \ \times 1\\ S^{+6}+2e\to S^{+4}\ \ \ \ \ \ \ \ \ \times 1\\ \Rightarrow PTHH:Zn+2H_2SO_4\to ZnSO_4+SO_2\uparrow+2H_2O\\ d,\ Fe+HNO_3\to Fe(NO_3)_3+NO\uparrow+H_2O\\ Fe^0-3e\to Fe^{+3}\ \ \ \ \ \ \ \ \times 1\\ N^{+5}+3e\to N^{+2}\ \ \ \ \ \ \ \ \times 1\\ \Rightarrow PTHH:Fe+4HNO_3\to Fe(NO_3)_3+NO\uparrow+2H_2O\\ e,\ Fe+HNO_3\to Fe(NO_3)_3+NH_4NO_3+H_2O\\ Fe^0-3e\to Fe^{+3}\ \ \ \ \ \ \ \times 8\\ N^{+5}+8e\to N^{-3}\ \ \ \ \ \ \ \times 3\\ \Rightarrow PTHH:8Fe+30HNO_3\to 8Fe(NO_3)_3+3NH_4NO_3+9H_2O\\ f,\ FeO+HNO_3\to Fe(NO_3)_3+NO\uparrow+H_2O\\ Fe^{+2}-1e\to Fe^{+3}\ \ \ \ \ \ \times 3\\ N^{+5}+3e\to N^{+2}\ \ \ \ \ \ \ \ \times 1\\ \Rightarrow PTHH:3FeO+10HNO_3\to 3Fe(NO_3)_3+NO\uparrow+5H_2O\end{array}\)
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