Cho các khí sau : N₂ , CH₄ , C₂H₄ , CO₂ , SO₂ .Những khí nào nặng hơn không khí:

A. C₂H₄ , CO₂ , SO₂.         B.  CO₂ , SO₂.    C. CH₄ , SO₂ , CO₂.   D. Tất cả đều sai.

Đốt cháy 1,5g khối lượng Mg trong không khí thu được 2,5g hợp chất Magie oxit (MgO). Khối lượng oxi tham gia phản ứng là:

A/ 0,8g                        B/ 0,9g                   C/ 1g                       D/ 1,1g

Số mol của 7,2.10²³ phân tử N₂ là………………..

A.0,5mol             B. 1mol              C. 1,2mol             D. 1,5mol

Khối lượng mol của axit sunfuric H₂SO₄ là:

Tokyo is a famous city. There are a few good buildings and impressive temples; there are a few parks worth visiting. Everything has to be small in Tokyo: houses, rooms, shops. Long-side streets consists of tiny houses only, and this often creates a toy-like, with small women tip-toeing along in their kimonos.

Tokyo at night is a very different place from Tokyo in daytime. Millions of neon signs are switched on and nowhere in the world is more attractive.

       A town is not its building alone; it is an atmosphere, its pleasure, its sadness, its

madness, and above all its people. Tokyo may lack architectural beauty but it has character

and excitement; it is alive. I found it a mysterious and loveable city.

43.There are many beautiful buildings in Tokyo.

    A. True                              B. Fasle

44.Many small houses are found along long roads.

    A. True                              B. Fasle

45.Tokyo at night is not as attractive as many other cities.

A. True                              B. Fasle

46.Tokyo has beautiful architecture.

    A. True                              B. Fasle