... khụng khớ v nc nh cú mng ụxit bo v? A- Fe v Al B- Fe v Cr C- Al v Cr D- Cu v Al 3 8- Hp kim no sau õy khụng phi l ca ng? A- ng thau B- ng thic C- Contantan D-Electron 2 ... B. 9,02 (g) C. 10,2(g) D. 11,2(g) 3 6- Cho 2,52g mt kim loi td vi dung dch H2SO4 loóng to ra 6,84g mui sunfat. Kim loi ú l : A-Mg B Fe C- Ca D- Al 3 7- Trong s cỏc cp kloi sau, cp no bn vng ... C. 48g D. 52g.3 4- Cú cỏc dd: HCl, HNO3, NaOH, AgNO3, NaNO3. Ch dựng thờm cht no sau õy nhn bit?A Cu B dung dch H2SO4 C dung dch BaCl2 D dung dch Ca(OH)23 5- Trn 5,4g Al vi...