6.11. Nguyen nhan tao thanh thach nhQ trong cac hang dong cf niii da v6i la : Ạ Do phan ling cua CO2 (trong kh6ng khi) v6i CaO thanh CaC03. Ạ Do phan ling cua CO2 (trong kh6ng khi) v6i CaO thanh CaC03. B. Do CaO tac dung v6i SO2 va O2 tao thanh CaS04.
C. Do sir phan hiiy CăHC03)2 -> CaCOg + H2O + COj t . . D. Do xay ra phan ung ihuan nghich sau mot thdi gian dai ; D. Do xay ra phan ung ihuan nghich sau mot thdi gian dai ;
CaC03 + CO2 + H2O < = ^ CăHC03)2
Hay chon dap an diing.
6.12. M6t hoc sinh noi :
Ạ Al(OH)3 la mot baza Iirang tinh vi no vira tac dung duac v6i dung dich HCl, vira tac dung vdi dung djch NaOH.
B. Al(OH)3 la mot baza vi khi nhiet phan cho AI2O3 va H 2 O .
C. A1(0H)3 la mot hidroxit luang tinh vi no c6 kha nang cho proton khi tac dung v6i baza va nhan proton khi tac dung v6i axit. khi tac dung v6i baza va nhan proton khi tac dung v6i axit.
D. A1(0H)3 CO the tac dung duac bat cur axit nao va baza naọ Hay chon dap an diing. Hay chon dap an diing.
6.13. Nhan dinh nao du6i day khSng diing v^ kim loai ki^m ? Ạ K i m loai kidm c6 tinh khu manh. Ạ K i m loai kidm c6 tinh khu manh.
B. K i m loai ki6m de cat got bang daọ
B. K i m loai ki6m de cat got bang daọ
6.15. Co cac phuang trinh hoa hoc: Ạ NaOH + SO2 NaHS03 . Ạ NaOH + SO2 NaHS03 .
B. 2NaOH + SO2 ^ Na2S03 + H 2 O .
C. 2NaOH + 2 NO2 -> 2 NaN03 + H2 T .
D. 2NaOH + 2 NO2 -> NaN03 + NaNOs + H 2 O .
Hay chon phuang trinh saị
Nhan xet nao dudi day ve mu6'i NaHC03 khong diing Ạ Mu6'i NaHCOg la mu6i axit.
B. Mu6'i NaHC03 kh6ng bj phan hiiy bai nhiet." C. Dung dich mu6'i NaHCOg c6 pH > 7. C. Dung dich mu6'i NaHCOg c6 pH > 7.
D. Ion HCOJ trong dung dich c6 tinh luang tinh.
6-17. Mu6'i an NaCI c6 ling dung : | Ạ Lam thirc an cho gia sue va ngir5ị B. Lkm dich truyen cho benh nhan. C. Dieu ché CI2, HCl va nu6c Giaven. D. Khir chua cho dát nong nghiep. Hay chon dap an saị