Trong những nhận xét dưới đây về muối nitrat của kim loại, nhận xét nào là không đúng? 

A. Tất cả các muối nitrat đều dễ tan trong nước

B. Muối nitrat là chất điện li mạnh, khi tan trong nước phân li ra cation kim loại và anion nitrat

C. Muối nitrat đều dễ bị phân hủy bởi nhiệt.

D. Muối nitrat chỉ được sử dụng làm phân bón hóa học trong nông nghiệp

Để phân biệt Glucôzơ, saccarozơ, tinh bột và Xenlulozơ có thể dùng các thuốc thử: (1) nước, (2) dung dịch AgNO₃/NH₃, (3) nước Iốt, (4) quỳ tím?

A. 2; 3 và 4

B. 1; 2 và 3

C. 3 và 4

D. 1 và 2

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 25 to 29. Fill in the appropriate word in question 29

My first job was a sales assistant at a large department store. I wanted to work part-time, because I was still studying at university and I was only able to work a few nights a week.

I came across the advertisement in the local newspaper. I remember the interview as though it were yesterday. The (25)______ manager sat behind a large desk. He asked me various questions which surprised me because all I wanted was to work in sales. An hours later, I was told that I had got the job and was given a contract to go over. I was to be trained for ten days before I took my post. Also, as a member of staff, I was (26) ______ to some benefits, including discounts.

When I eventually started, I was responsible (27) ______ the toy section. I really enjoyed it there and I loved demonstrating the different toys. I was surprised at how friendly my colleagues were, too. They made working there fun even when we had to deal with customers (28) ______ got on our nerves. (29) ______, working there was a great experience which I will never forget.

A. In contrast

B. However

C. Moreover

D. On the whole