1 có tính oxi hóa, , VD1: – Cl2 Cl2 2e 2Cl Na e Na 21 M ne n M Phi kim n (8 n) X (8 - n).e X X có n X n n.e X –(8 – n) +n n –(8 – n) +n VD2: 2, Fe, Cu, Cl2, F2 2, Cl2, P, S VD3: – S (Z = 16): 1s22s22p63s23p4 –2 +6 – Cl (Z = 17): 1s22s22p63s23p5 –1 +7 31 có tính oxi hóa Li, Na, K, Ag Mg, Ca, Ba, Zn Al Fe Cr Mn Cu +1 +2 +3 +2, +3 +2, +3, +6 +2, +4, +6, +7 +1, +2 n – (8 –n) + n +n – (8 – n) tính oxi hóa H Cl, Br, I S P N –1, +1 –1, +1, +3, +5, +7 –2, +4, +6 –3, +3, +5 –3, +1, +2, +3, +4, +5 Chú ý – Trong H2O2 hai anion O2– F– oxi H2O2 VD4: +, Cl–, Fe2+, NO, NO3–, Al3+, Mn2+, H+, SO2, Fe3+ Na+, Al3+,Fe3+, H+, NO3– Cl– Fe2+, Mn2+, NO, SO2 VD5: H2 + Xét HNO3: HNO3 có tính oxi hóa HNO3 + Xét H2S: H2 S2– H2 NO3– S2– + có tính oxi hóa tính oxi hóa trung gian (A) F2 (B) Na (A) S tính oxi hóa? (B) Fe (C) H2S (D) C (A) Ca (B) Al (C) P (D) F2 (A) Cu (B) Cl2 (C) F2 (D) N2 (A) (C) HCl 2, (B) (D) HNO3 C, F2, P, O2 (C) (D) (A) +2 –6 (C) –2 +6 (B) +6 –2 (D) –6 +2 (A) –2 +6 (C) –4 +4 (A) NO2 (B) –3 +5 (D) –6 +2 (B) NH3 (C) N2O (D) HNO3 (A) SO2 (B) Na2SO4 (C) H2S (D) H2SO4 A Cho ion: Na+, Fe2+, Cu2+, Br–, S2–, Al3+ hóa (A) Na+, Cu2+, Br– (B) Fe2+, Al3+ (C) Br–, S2– (D) Na+, Cu2+, Al3+ B Cho ion: K+, Fe2+, Cr3+, Mn2+, N3–, Cl– (A) (B) C (C) 2+, (A) (D) Cu2+, N2, Al3+ (B) (C) (D) D (A) NaNO3 (B) K2SO4 (C) SO2 (D) H2SO4 E (A) H2O2 (B) HCl (C) HNO3 F (D) H2S 2, Cu2+, ClA) B) N2, HCl, D) C) G 2, Fe2+, Cu2+ A B) D) C) H 2, Na+, Fe2+, Fe3+ A B) D) C) I SO2, NO2, C, Al, Mg2+ 2, F2, SO2, Na+, Ca2+, Fe2+, Al3+, Mn2+, S2-, ClA) J Fe2(SO4)3 A) B) C) 2, B) D) FeCl3, Fe(NO3)2, Fe(NO3)3, FeSO4, C) D) K (A) 2S, (B) FeSO4, H2S, Ag, Fe, KMnO4, Na2SO3, Fe(OH)2 (C) L –, MnO2, Na, Cu, SO32– (A) (B) (C) (D) Na2S, NO2, Fe2+, SO2, Fe3+, N2O5, SO42–, (D) Câu B Câu C B B D C C E C C F B B G A C H B C I B D J D C K B A D L B B D