... (3) , (4) , (6) Cõu 25: Nng mol/l ca ion H+ d2 NaOH 0,001M l: A 10-3 M B 10-2 M C 10-10 M D 10 -11 M Cõu 26: Cho 200 ml dd Ba(OH)2 0,2M vo 300 ml dd HCl 0,1M Khi lng BaCl2 thu c l : ( Cho Ba = ... thu c 4,48 lớt hn hp khớ N 2O v N2 (ktc) Phn trm theo kh i l ng khớ N2O v N2 l: A 72% v 28% B 61 ,11% v 38,89% C 48,84% v 51,16% D 51,16% v 48,84% Cõu 53: Cho s :NO2 + O A + H 2O Mg (OH ) + ... D 4,1 Cõu 57: Dung dch baz mnh Ba(OH)2 cú [Ba2+] = 0,0005 M pH ca dung dch ny l: A 9,3 B 8,7 C 11 D 14,3 Cõu 58:Nhng cp cht no sau õy cựng tn ti mt dung dch? A NaHCO3 v NaOH B HCl v AgNO3 C KOH...