- Cr(0H) 3 : Mau xanh.
- Al(OH) 3 : Ket tua nhdy, mau trdng duẹ Dap an dung la A
5 1 . Trong dung dich A c6 chura d6ng thdi cac cation: Na*, Ag*, Ba"*, Al'*, Zn"*, N H 4 , Fé*. Fe"* va chi chiia m6t loai anion. Anion do c6 the la N H 4 , Fé*. Fe"* va chi chiia m6t loai anion. Anion do c6 the la
Ạ Cr. B. N O ; . B . SO4-". D . PO4'". '
' Huong dan gidi '
- Anion do CO the la NOj" VI cac muoi nitrat d a u tan.''^ f f ' ' - Neu la cr, 8 0 4 - ' hay P04^" thi c6 ion doi khang nfen xuSt hien ket tiia, chang - Neu la cr, 8 0 4 - ' hay P04^" thi c6 ion doi khang nfen xuSt hien ket tiia, chang
han AgCl, Ag2S04, BaS04, Ag3P04, Ba,(P04),,...
Dap an dung la B.
5 2 . Trong cac cap khf sau, cap chiJa cac khi c6 the cung tdn tai vdi nhau a bat ki
didu kien nao la
f Ạ F. va Ọ. B. N , vh O,. C. CO, va H , .
Huong đn gidi
Xet cac cap khf:
D. C O va a , .
hi
Ạ F, + O , B . N , + O . B . N , + O .
-> kh6ng xay ra phan ling.
3000"r 2NO(loai). C. C O , + H , D. C O + CU XỊI" ± CO + H 2 0(loai).
COCUCloai). Dap an dung la Ạ
Chu y: Halogen khong phan ung trirc tlep vdi O,.
5 3 . nhan bid't ion Cu"* c6 mat trong dung dich h6n hop chita cac cation Fê*,
Cú*, Fe"*, Na*, Ni"* (v6i anion NÔ ) c6 the diing dung dich
A . N a O H d u . B . N H j d u . C.Na3P04dụ D. K . C O , dụ
Huong đn gidi
De nhan dien Cu"* (trong h6n hap) c6 the dung NH, du:
2NH3 + 2H2O + cu-' — > cu(0H)4+2N H ;
=> Cu(0H)2 CO trong h6n hop ket tiia hidroxit.
Cu(OH)2 + 4NH, > [Cu(NH3)4]-'+ 20H- xanh thSm
(Trong cac kS't tiia hidroxit sinh ra chi c6 Cu(0H)2 tan trong dung djch NH, tao ra dung dich mau xanh thSm). Dap an dung la B .
5 4 . Nhiing day Pt vao dung djch mu6'i X, r6i dot tren ngon lira den c6n thay ngon lira CO mau vang tuoị Neu cho bot Cu va dung dich HCl dac vao dng nghiem lira CO mau vang tuoị Neu cho bot Cu va dung dich HCl dac vao dng nghiem
chiia mu6'i X, tháy c6 khf bj hod nau trong khong khf bay rạ Mu6'i X la (adsbygoogle = window.adsbygoogle || []).push({});
Ạ NaCl. B . KNO3. C. NaNOv D.KNO,.
Hu&ng đn gidi
- Mu6'i X '''' ''°'> ngon lira mau vang tuoi
=> trong X CO natrị 296
- X + Cu + HCl > N O (khf hi hoa nSu trong kh6ng khf: 2NO + O , > 2NO, mau nftu)
zi> X la mudi N O ~ hoac N O ' .
..'1 s:>}lc\ii-- ; , r •.• .
Theo cac phuomg an => X la NaNO,.
Dap an dung la C.
55. De loai khf H2S ra khoi h6n hop HCl va H2S, c6 the diing dung djch dam dac (duoc láy vira dii)
Ạ Pb(N03)2. B . AgNOj. C. CuCỤ D. FeCỤ
Hu&ng đn gidi
Co the dung dung dich CuCK: .n-'.'-l ,
HCl + CuCU
H2S + C U C I 2 > CuSi + 2 H a
Dap an dung la C .
hii y: K h o n g dung Pb(NO,)2, A g N O , hay FeCK v i : 2HC1 +Pb(N03)2 > P b C l 2 i + 2HN03
H Q + AgN03 > AgOi + HNO3 ,
H 2 S + F e a 2-^e->
6. Khi dieu che CO2 tir CaCO, va dung dich HCl thi khf CO2 thu dirge eo lan HCl va hai nuoc. De thu duoc C 0 2 t i n h khiet, ngucri ta cho h6n hop khf sau phiin ling di Idn lugt qua cac binh chii"a
Ạ NaOH; H2SO4 dac. B . NaHCOj; H2SO4 dac. C. H2SO4 dac; NaOH. D. AgNOj; H2SO4 dac.
Huong đn gidi
- Truoc tien phai loai HCl bang dung dich NaHC03 du: NaHCO, + HCl > NaCl + CÔT + H2O
- Sau do, lam kh6 khf C O 2 bang H 2 S O 4 dac. Dap an dung la B .
Chii y: - De loai HCl khong dung NaOH hay AgN03 v i : NaOH + CO2 > NaHC03
AgN03 + HCl > A g C l i + HN03t (HNO3 bj loi cuon theo CO2)