Hay chon dap s6 diing.
6.73- Trgn 5,4 gam bgt A l vdi 17,4 gam b6t Fe304 r6i cho tien hanh phan iJng nhiet nh6m. Gia sir chi xay ra phan urng khir Fe304 thanh Fẹ Hoa iJng nhiet nh6m. Gia sir chi xay ra phan urng khir Fe304 thanh Fẹ Hoa tan hoan loan h6n hgp ran sau phan iJng bang dung dich H2SO4 loang, thu dugc 3,024 lit k h i H2 (dktc).
Hieu suat ciia phan tíng nhiet nhom la :
Ạ 12,65% ; B. 20,16%; C. 60,0% ; D. 82,7%. C. 60,0% ; D. 82,7%. Hay chon.dap so dung.
6.74. Trgn 0,81 gam b6t A l v6i b6t Fe304 va CuO r6i nung nong dé tien hanh phan dng nhidt nh6m, thu dugc h6n hgp Ạ Hoa tan A trong dung hanh phan dng nhidt nh6m, thu dugc h6n hgp Ạ Hoa tan A trong dung dich HNO3 loang, nong, thu dugc V lit khi NO (dktc).
Gia tri ciia V la :
Ạ 0,224 lit ; B. 2,24 lit ; C. 6,72 lit ; D. 0,672 l i t . Hay chgn dap s6' dung.
|6.75. Trgn 100 ml dung dich h6n hgp g6m HCl 0,4M va H2SO4 0,1M vdi
400 ml dung dich h6n hgp g6m NaOH 0,1M va Bă0H)2 xM, ihu dugc
ke't tiia va 500 ml dung dich c6 pH = 2. Gia trj cua x la bao nhi6u ?
Ạ X = 0,05125M ; B. x = 0,05208M ; C. X = 0,03125M ; D. x = 0,0625M.
6.76. Tren hai dla cSn dat hai c6'c khAng. Can thang bang. Cho vao c6'c trai 5,4 gam Al, vao coc phai 15,38 gam CaC03. Can mat thang bang. Can them bao nhidu gam HCl 7,3% vao coc trai de cho cSn tra lai can bang: Ạ 9,98 gam ; B. 10,00 gam ;
C. 10,12 gam ; D. 10,08 gam ; Hay chpn dap s6' diing.
6.77. Dung dich X chura 0,6 mol NaHCOj va 0,3 mol Na2C03. Them rát tCr tir dung dich chiJa 0,8 mol HCl vao dung dich X, duoc dung dich Y va V lit CO2 (dktc). Them vao dung dich Y nude voi trong du tháy tao thanh m gam két tiiạ Thé tich V va khoi hrcrng m la :
Ạ 11,2 lit CO2 va40gam CaCỘ B. 16,8 lit CO2 va 60 gam CaCOg. C. 11,2 lit CO2 va 80 gam CaCOj. D. 16,8 lit CO2 va 90 gam CaCOj. Hay chon dap an diing.
112
ChiiOng 7
CROM - Si^T - DONG
Crom (Z = 24) c6 s6' electron hoa tri b trang thai cor ban la :
Ạ 3 electron ; B. 4 electron ; C. 5 electron ; D. 6 electron. Hay chon dap dn dung.
S6' hieu nguyen ti^ciia Cr 1^ 24. Vi tri ciia Cr (chu ki, nhom) trong bang luan hoan la :
Ạ Chu ki 4, nhom VIB. B. Chu ki 3, nhom VIB. C. Chu ki 4, nhom IHB. D. Chu ki 3, nhom IIB. Hay chpn dap an diing.
S6 hieu nguyen tir ciia Cr la 24. Oxit cao nhát ciia crom tac dung vcfi nu6c tao thanh :
Ạ H2Cr04 : axit cromic. B. H2Cr207 : axit dicromic. C. H4Cr20g : axit pecromic. D. H6n hop H2Cr04 v^ H2Cr207. Hay chpn dap an dung. ' Crom kim loai c6 nhOng tinh chat:
1) Curng nhát trong tat ca cdc kim loaị 2) Dan dien t6't nhát trong tát ca cac kim loaị
3) Tan dupe trong dung dich HCl cung nhu trong dung dich NaOH. 4) Co nhiet d6 nong chay caọ
5) Crom thu6c nhom kim loai nang. 6) Tdc dung v6i nudrc cf nhiet d6 thudng.
Nhifng tinh chat ntu diing la :
Ạ 1,2, 4, 5 ; B. 1,4, 5; C. 2, 4, 6 ; D. 2, 3, 5, 6. Hay chon dap an diing.
7.5. Co cac h5a chat : H2O, dung dich HCl, dung dich NaOH, dung dich NaCl, dung dich KI, dung dich K2Cr04.
Crom (III) oxit tac dung duoc v6i cac dung dich : Ạ H2O, HCl, NaOH, NaCl.
B. HCl, NaOH.
C. HCl, NaOH, K2Cr04. D. HCl, NaOH, KỊ Hay chpn dap an dung.
7.6. Hay chon nhirng mfinh 66 diing n6i vfe sat :
1) sat thu6c chu ki 4, nhom VIIIB. 2) Sat thu6c nh6m kim loai nhẹ
' 3) Sat de bi nhiem tCr (bi nam cham hiit).
4) Sat c6 th^ hoa tan trong axit H2SO4 dac, ngupi nhirng kh6ng the hoa tan trong dung dich NaOH dac.
5) Sat c6 tinh khir manh han d6ng.
6) Quang CO gi^ tri nhát d^ san xuát gang la quang pirit. Ạ 2, 4, 6; B. 1,2, 4, 6; C. 1, 3, 5, ; D. 2, 4, 5, 6.
7.7. Cho 1 gam b6t sat nguydn chat tiép xuc v6i kh6ng khi m6t th6i gian, tháy khd'i luong bdt vupt qua 1,41 gam.
Oxit duy nhát dupe tao thanh la :
Ạ FeỌ
B. FejOj. C. Fe304.
D. Ca A, B, C deu diing. Hay chpn dap an diing.
Co cac dung dich mu6'i: FeClj , FeClj, MgCl2, AICI3, NaCl, NH4CỊ
Di phan biet cac dung dich mu6'i clorua nay cSn diing hoa chát :
Ạ Dung dich AgN03 . B. Dung dich NH3 . C. Dung dich H2SO4 .
D. Dung djch KOH.
Hay chpn dap an diing. ' • Dong kim loai c6 nhirng tinh chat :
1) Hoa tan dupe trong dung djch HCl, giai phong H2 - 2) Dan dien va dan nhiet rát t6't, chi kem bac.
3) Tan dupe trong dung dich FeCl3.
4) Hoa tan dupe trong dung dich HCl c6 mat O2.
5) Thupc nhom kim loai nhe (d = 8,98 g/cm^).
6) D6ng thau la hop kim ciia Cu - Sn.
Nhifng tinh chát ntu diing la :
Ạ 2, 3,4; B. 2, 3, 4, 6; C. 1, 2, 3, 5 ; D. 1, 4, 6. Hay chpn dap an diing.
Bac CO so hieu nguyen tir Z= 47. Vi tri cua Ag trong bang tu&n hoan la:
Ạ Chu ki 5, nhom lA .
B. Chu ki 5, nhom IB. ' "
C. Chu ki 4, nh6m IB. D. Chu ki 5, nhom IIB;
Hay chpn dap dn diing. '
7.11. So sdnh tinh chát cua d6ng, bac, vang ngudi ta tháy :
1) Tính khix yfíu dSn theo thir tir Cu > Ag > Aụ 2) Ca 3 kim loai deu tac dung vdri dung dich HNO3.
3) Ca 3 kim loai d^u c6 th^ t6n tai trong tir nhifin dudi dang dan chát.
4) Chi CO Cu va Ag hoa tan duac trong dung dich HNO3.
5) Chi CO Cu mdi hoa tan dugc trong dung dich HCl. NhCrng tinh chát ntu diing : NhCrng tinh chát ntu diing :
Ạ 1,2,4; B. 1.5, i ; C . 1 , 3 , 4 ; D. 1,2, 3, 5.
Hay chon đp in dung.
7.12. Kem c6 s6 hieu nguydn tir Z = 30. Vi tri cua Zn trong bang tuSn
hôn la :
Ạ Chu ki 4, nh6m HA . B. Chu ki 5, nhom IIB. C. Chu ki 3, nh6m IIB. D. Chu ki 4, nh6m IIB;
Hay chon dap an dung. |
7.13. d nhiet d6 tháp han 570°C, Fe t^c dung v6i hai nirdc cho san ph^m la:
Ạ Fe304 va Hj; B. FejOj va Hj;