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4 ý cuối :
1)
Cu + 2H2SO4→ CuSO4+ SO2+2H2O
Cu0 →Cu+2 +2e║ x1
S+6+2e →S+4 ║ x1
2)
2Al+ 4H2SO4→ Al2(SO4)3+ S+ 4H2O
2Al0→2Al+3 +6e║x1
S+6 +6e→S0 ║x1
3)
4Zn +5H2SO4→ 4ZnSO4+ H2S+ 4H2O
Zn0\(\rightarrow\) Zn+2 +2e ║x4
S+6 +8e →S−2 ║x1
4)
8Fe+ 15H2SO4→ 4Fe2(SO4)3+3H2S+ 12H2O
2Fe0→ 2Fe+3+6e║x4
S+6 +8e →S−2 ║x3
6 ý đầu
1.\(\overset{-3}{4NH_2}+\overset{0}{5O_2}\rightarrow\overset{+2+6}{4NO}+\overset{-2}{6H_2O}\)
4 X \(||\) N-3 + 5e → N+2
5 X \(||\) 2O0 + 4e → 2O-2
2.\(\overset{-3}{4NH3}+\overset{0}{3O_2}\rightarrow\overset{0}{2N_2}+\overset{-2}{6H_2O}\)
2 X \(||\) 2N-3 + 6e → 2N0
3 X \(||\) 2O0 + 4e → 2O-2
3.\(\overset{0}{3Mg}+\overset{+5}{8NO_3}\rightarrow\overset{+2}{3Mg\left(NO_3\right)_2}+\overset{+2}{2NO}+\overset{ }{4H_2O}\)
3 X \(||\) Mg0 → Mg+2 + 2e
2 X \(||\) N+5 + 3e → N+2
4.\(\overset{0}{Al}+\overset{+5}{6NO_3}\rightarrow\overset{+3}{Al\left(NO_3\right)_3}+\overset{+4}{3NO_2}+\overset{ }{3H_2O}\)
1 X \(||\) Al0 → Al+3 + 3e
3 X \(||\) N+5 + 1e → N+4
5.\(\overset{0}{Zn}+\overset{+5}{4HNO_3}\rightarrow\overset{+3}{Fe\left(NO_3\right)_3}+\overset{+2}{NO}+\overset{ }{2H_2O}\)
1 X \(||\) Zn0 → Mg+2 + 2e
2 X \(||\) N+5 + 3e → N+4
6.\(\overset{0}{Fe}+\overset{+5}{4HNO_3}\rightarrow\overset{+3}{Fe\left(NO_3\right)_3}+\overset{+2}{NO}+\overset{ }{2H_2O}\)
1 X \(||\) Fe0 → Fe+3 + 3e
1 X \(||\) N+5 + 3e → N+2
\(\overset{+2}{Fe}\overset{-2}{S}+H\overset{+5}{N}O_3+H_2O\rightarrow\overset{+3}{Fe}\left(NO_3\right)_3+\overset{+3}{Fe}_2\left(\overset{+6}{S}O_4\right)_3+\overset{-3}{N}H_4NO_3\) quá trình OXH : \(3\overset{+2}{Fe}+3\overset{-2}{S}\rightarrow3\overset{+3}{Fe}+3\overset{+6}{S}+27e|\times8\)
quá trình khử : \(\overset{+5}{N}+8e\rightarrow\overset{-3}{N}|\times27\)
\(\Rightarrow\) \(24FeS+78HNO_3+15H_2O\rightarrow8Fe\left(NO_3\right)_3+8Fe_2\left(SO_4\right)_3+27NH_4NO_3\)
3\(Fe_xO_Y+\left(12-2y\right)HNO_3-->\)3xFe(NO3)3 +(3-2y)NO2 +(6x-y)H2O
Nhớ tích cho mk nhé
1. FeS+6HNO3------>Fe(NO3)3+ H2SO4+3NO+2H2O
2. FeS2+8HNO3------>Fe(NO3)3+ 2H2SO4+5NO+2H2O
3. 5Zn+ 12HNO3--------->5Zn(NO3)2+N2+6H2O
4. PbO2+4HCl------->PbCl2+Cl2+ 2H2O
5. FeS2+8HNO3------->2H2SO4+ Fe(NO3)2+5NO↑+ 2H2O
6. 2FeI2+ 6H2SO4 đặc, nóng------> Fe2(SO4)3+ 2I2+ 3SO2↑+ 6H2O
Đáp án D