Hòa tan 12g \(SO_3\) vào nước dư, được dung dịch X. Để trung hòa hết dd X cần dùng:

A. 12g NaOH

B. 6g NaOH

C. 14,7g NaOH

D. 10g NaOH

Điều chế \(Cu\left(OH\right)_2\) ta dùng chất nào sau đây?

A. \(CuCl_2\) và KOH

B. \(CuSO_4\) và NaCl

C. Cu và NaOH 

D. \(Cu\left(NO_3\right)_2\) và KCl

Tìm lỗi sai và chữa lại:

1. We are in the church yesterday.

2. Did she asked you a lot of question?

3. What were you do last night? I did my homework

4. I writed a letter to my penpal last week.

5. He wasn't go out with his father to see a soccer match.

6. My father drove a car to work but he comes home very late.

7. Last year, they moved to the countryside and build a new house there.

8. She lied on the couch and watched the television.

9. We not painted the house yellow and white because we hates these colors.

10. Minh picking up the ball and fixed it for his son.

Hoàn thành các câu sau:

1. I/ be/ school/ my friends/ last Sunday

2. We/ be not/ absent from class/ yesterday morning.

3. your uncle/ be/ an engineer/ this factory/ 25 years ago?

4. She/ be not/ TV/ last night

5. They/ study English/ 4 years ago

6. He/ live/ the farm/ his grandfather/ 2019

7. you/ follow your mom to the market/ this morning?

8. the cat/ catch a mouse/ the kitchen/ yesterday evening?

9. Mrs Bkake/ not/ teach/ this school/ many years ago.

10. her children/ play soccer in this stadium/ last Saturday?

Hoàn thành các câu sau:

1. I/ be/ school/ my friends/ last Sunday

2. We/ be not/ absent from class/ yesterday morning.

3. your uncle/ be/ an engineer/ this factory/ 25 years ago?

4. She/ be not/ TV/ last night

5. They/ study English/ 4 years ago

6. He/ live/ the farm/ his grandfather/ 2019

7. you/ follow your mom to the market/ this morning?

8. the cat/ catch a mouse/ the kitchen/ yesterday evening?

9. Mrs Bkake/ not/ teach/ this school/ many years ago.

10. her children/ play soccer in this stadium/ last Saturday?

Chất được sử dụng để trung hòa axit là: 

A. \(Al\left(OH\right)_3\)

B. \(Fe\left(OH\right)_2\)

C. NaOH

D. \(Cu\left(OH\right)_2\)

Nhóm các bazo làm quỳ tím ẩm hóa xanh là:

A. \(Ba\left(OH\right)_2\) , \(Ca\left(OH\right)_2\)

B. \(Mg\left(OH\right)_2\) , \(Ba\left(OH\right)_2\)

C. \(Mg\left(OH\right)_2\) ,\(Ca\left(OH\right)_2\)

Trong các dãy chất sau đây, dãy naò thỏa mãn đk tất cả đều phản ứng với HCl?

A. Cu, BaO, \(Ca\left(OH\right)_2\) , \(NaNO_3\) 

B. Qùy tím, Zn, NO, CaO, \(AgNO_3\)

C. Qùy tím, CuO, Zn, \(AgNO_3\) , \(Ba\left(OH\right)_2\)

D. Qùy tím, CuO, Cu, \(AgNO_3\)

Thuốc thử nào sau đây không phân biệt được hai dung dịch riêng biệt HCl, \(H_2SO_4\) ?

A. \(BaCl_2\)            B. Zn           C.\(BA\left(OH\right)_2\)                 D. Ba