... A 1, 2, 3, B 1, 2, 4, C 1, 4, 2, D 2, 1, 3, Cõu 12 0 Cu hỡnh electron ỳng ca nguyờn t nguyờn t Cu (Z = 29) l{: A 1s22s22p63s23p63d94s2 B 1s22s22p63s23p63d104s1 C 1s22s22p63s23p63d64s24p3 D 1s22s22p63s23p64s33d8 ... 1s22s22p63s23p63d64s2 B 1s22s22p63s23p63d8 C 1s22s22p63s23p63d6 D 1s22s22p63s23p63d44s2 Cõu 19 8 Dung dch NH3 0 ,1 M cú in li bng 1% pH ca dung dch NH3 bng: A 10 ,5 B 11 ,0 C 12 ,5 D 13 ,0 Cõu 19 9 Nung 44 gam hn hp X ... 0,9m gam So s|nh t l V2 / V1 thy A V2 / V1 = 2,7 hoc V2 / V1 = 3,55 B V2 / V1 = 2,5 hoc V2 / V1 = 3,25 C V2 / V1 = 1, 7 hoc V2 / V1 = 3,75 D V2 / V1 = 2,5 hoc V2 / V1 = 3,55 Cõu 76.Mnh n{o sau...