... 2O3 Nng ban u ca oxi l 0,045 mol/l Sau 10 giõy nng ca oxi cũn l 0,041 mol/l Tc ca phn ng ny thi gian ú l A 10- 3 mol/l.s B 10- 5 mol/l.s C 0,4 10- 3 mol/l.s D 0,4 10- 4 mol/l.s PA: C HH1034NCV ... HH1026NCV Hũa tan m gam kim loi húa tr II bng dung dch HCl 14,6% va , thu c mt dung dch mui cú nng 18,19% Kim loi ó dựng l A Fe B Zn C Mg D Ca PA: C HH1026NCV Ch 2,4g kim loi X húa tr II vo 200m ... D dung dch NaOH, dung dch HCl PA: C HH1030NCV: Ly 5,3g hn hp gm Na v kim loi kim X cho tỏc dng vi dung dch H2SO4 lng thu c 3,36 lớt khớ (ktc) Kim loi kim X v phn trm lng ca nú hn hp l: A K;...