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Ag2O bng CO hoc H2 to cao Phng phỏp ỳng l A:1 ; B : 1 v 2 ; C : 2 ; D : C 1 , 2 v 3 245.Mt tm kim loi vng b bỏm mt lp Fe b mt, cú th ra lp Fe c Au bng dd: A CuSO4 B FeCl3 C FeSO4 D AgNO3 246.T Mg(OH)2 ngi ta iu ch Mg bng cỏch no trong cỏc cỏch sau 1/ in phõn Mg(OH)2 núng chy 2/ Ho tan Mg(OH)2 vo dung dch HCl sau ú in phõn dung dch MgCl2 cú mng ngn 3/ Nhit phõn Mg(OH)2 sau ú kh MgO bng CO hoc H2 ... 11,3% B 12% C 12,2% D 13% 319.ờ iờ u chờ K kim loa i ngi ta co thờ dung cac phng phap sau: 1> iờn phõn dung dich KCl co vach ngn xụ p 2> iờn phõn KCl nong chay 3> Dung Li ờ kh K ra khoi dd KCl 4> Dung CO ờ kh K ra khoi K2O 5> iờn phõn nong chay KOH Cho n phng phap thich h p a> Chi co 1, 2 b> Chi co 2, 5 c> Chi co 3, 4, 5 d> 1, 2, 3, 4, 5 320.Cho 2,3g Na tỏc dng mg H2O thu c dung dch 4% Khi lng H2O... tỏc dng 100g H2O thu c 100ml dung dch cú pH = 14; nNa : nK = 1 : 4 m cú giỏ tr: A 3,5g B 3,58g C 4g D 4,6g 324.Hụn h p X gụ m 2 kim loa i kiờ m A, B thuụ c 2 chu ky kờ tiờ p cua BTH Lõ y 3,1 (g) X hoa tan hoan toan vao nc thu c 1,12 lit H 2 (ktc) A, B la 2 kim loa i: a> Li, Na b> Na, K c> K, Rb d> Rb, Cs 325.4,41g hn hp KNO3, NaNO3; t l mol 1 : 4 Nhit phõn hon ton thu c khớ cú s mol: 31 A 0,025 B 0,0275... Nụ ng ụ mol/l cua dung dich NaOH A 1 B 2 C 0,5 D 3 219.Z l axit hu c n chc t chỏy 0,1 mol Z cn 6,72 lớt O2 ( ktc) Cho bit CTCT ca Z ? A CH3COOH B CH2= CH-COOH C HCOOH D CH3- CH2-COOH 220 ụ t chay hoan toan 2,25g h p chõ t hu c A thu c 4,95g CO2 va 2,7g H2O cung iờ u kiờn nhiờt ụ ap suõ t 0,75g A co thờ tich hi b ng thờ tich 0,4g khi oxi Cụng thc cõ u ta o ung cua A biờ t A ma ch th ng, tac... trựng hp Phn ng trựng ngng B Phn ng ng trựng hp hay phn ng ng trựng ngng D: Tt c u ỳng Tt c u ỳng 162. iu ch polime ta thc hin phn ng: A: Cng; B: Phn ng trựng hp; C: phn ng trựng ngng; D: Phn ng trựng hp hoc phn ng trựng ngng 163.nh ngha no sau õy ỳng nht A Phn ng trựng ngng l quỏ trỡnh cng hp nhiu phõn t nh thnh phõn t ln B Phn ng trựng ngng cú s nhng nhn electron C Phn ng trựng ngng l quỏ trỡnh cng hp... A B C2H5OH Cỏc cht A,B l: A Tinh bt, glucoz B Tinh bt, Xenluloz C Tinh bt, saccaroz D Glucoz, Xenluloz 169.Cú th iu ch PE bng phn ng trựng hp monome sau: A: CH2CH2; B: CH2=CHCH3; C: CH2CHCl; D: CH2=CHOCOCH3 170.Da vo tớnh cht no kt lun tinh bt v xenluloz l nhng polime thiờn nhiờn cú cụng thc (C6H10O5)n A Tinh bt v xenluloz khi b t chỏy u cho CO2 v H2O theo t l s mol 6 : 5 B Tinh bt v xenluloz khi... cụng thc [(-CO-(CH2)4-CO-NH-(CH2)6-NH-]n thuc loi no? A Cht do Cao su T nilon T capron 172.iu kin mụnme cú th c dựng iu ch polime: A: Cú liờn kt n; B: Cú liờn kt ụi; C: Cú liờn kt ba; D: Cú liờn kt ụi hoc ba 173.Cao su Buna khụng tham gia phn ng no trong s cỏc phn ng sau: A Cng H2 Vi dung dch NaOH Vi Cl2/as Cng dung dch brụm 174.Cho (1) Etanol; (2): Vinylaxetylen; (3) Isopren; (4) 2-phenyletanol-1 Tp... 0,0275 C 0,3 D 0,315 326.Mụ t hụn h p n ng 14,3 (g) gụ m K va Zn tan hờ t trong nc d cho ra dung dich chi cha chõ t duy nhõ t la muụ i Xac inh khụ i l ng mụi kim loa i trong hụn h p va thờ tich khi H2 thoat ra (ktc) a> 3,9 g K, 10,4 g Zn, 2,24 (l) H2 b> 7,8 g K, 6,5 g Zn, 2,24 (l) H2 c> 7,8 g K, 6,5g Zn, 4,48 (l) H2 d> 7,8 g K, 6,5 g Zn, 1,12 (l) H2 327.Cho 1,5g hn hp Na v kim loi kim A tỏc dng vi H2O