... v Mg2+ nc cng D) un sụi nc cng lm mt tớnh cng tm thi ca ca nc 31 Cu hỡnh electron no di õy vit ỳng: A) 26 Fe2+ : 1s22s22p63s23p63d44s2 B) 26 Fe3+ : 1s22s22p63s23p63d5 2+ 2 6 C) 26 Fe : 1s 2s 2p ... K+, Cu2+, SO 4 2- , NO 3-, Br- Trong dung dch, nhng ion no khụng b in phõn? A) Ca2+, Cu2+, SO 4 2- B) Ca2+, K+, SO 4 2- , NO 3- + 2+ 2C) K , Cu , SO4 D) Ca2+, K+, SO 4 2- , Br- 52 X phũng hoỏ hon ton 10 ... = 28 Aminoaxit Y cha nhúm COOH v nhúm NH2 cho mol Y tỏc dng ht vi dung dch HCl v cụ cn thỡ thu c 20 5g mui khan Cụng thc phõn t ca Y l: A) C5H12N2O2 B) C5H10N2O2 C) C4H10N2O2 D) C6H14N2O2 29 ...