... khỏc Cõu 16 : Mu nõu ca dung dch Fe(NO3)3 l : A.Mu ca Fe(OH)3 B.Mu ca ion NO3C.Mu ca ion Fe3+ D.Mu ca ion Fe 2+ Cõu 17 : Thi lung khớ CO qua ng s ng m(gam) hn hp gm Al2O3, MgO, Fe2O3, FeO, CuO ... ng thi Cu(NO 3)2 v AgNO3 c hn hp rn X gm kim loi X gm : A.Al, Ag B.Fe, Ag C.Cu, Ag D.Cu, Fe Cõu 48 : Dung dch no sau õy cú mụi trng baz : A.Na2SO4 B.NaNO3 C.NaCl D.Na 2CO3 Cõu 49 : Hp th hon ton ... cha 0,2 mol Ca(OH)2 thu c 2,5g kt ta.Tớnh V : A.0,56l B.8,4l C.11,2l D.A hoc B Cõu 27 : t chỏy hon ton 7,6g hai ru n chc, mch h, liờn tip cựng dóy ng ng thu c 7,84l CO2 (ktc) v 9g H2O Cụng thc phõn...