... 18 Cỏc ion no sau khụng th cựng tn ti mt dung dch? A Na+, Mg2+, NO , SO B Ba2+, Al3+, Cl, HSO 4 + 2+ 3+ + C Cu , Fe , SO , Cl D K , NH , OH , PO Cõu 19 Axit HNO3 cú th phn ng vi c nhng kim ... 20% thu c dung dch X Dung dch X cha cỏc mui sau: A Na3PO4 B NaH2PO4 v Na2HPO4 C NaH2PO4 D Na2HPO4 v Na3PO4 Cõu 22 Cho 8,8 gam hai kim loi thuc nhúm IIA v hai chu kỡ liờn tip tỏc dng vi HCl d, thu ... Zn lm cht chng n mũn D Dựng Zn l kim loi khụng g Cõu 52 in phõn dung dch mui CuSO4 d, in cc tr thi gian 1930 giõy, thu c 1,92 gam Cu catot Cng dũng in quỏ trỡnh in phõn l: A 3,0 A B 4,5 A C 1,5...