ÔN TẬP

If you___life, life will___you back.

• love/love

• loves/love

• loved/love

• love/loved

It was John____took the key.

• whom

• who

• that

• which

I hate___housework.

• do

• to do

• does

• doing

My new phone broke, so I am going to___it to the store.

• rent

• return

• keep

• book

My mother,____I really admire, is a good doctor.

• whom

• that

• whose

• which

Gold____in California in the 19th century.

• discovered

• has been discovered

• was discovered

• were discovered

The town____I grew up is small.

• who

• whom

• which

• where

Xác định số oxi hóa của N trong hợp chất sau: NH₃

• - 3

• + 3

• 1

• 2

Cho hợp chất NH⁺₄, NO₂, N₂O, NO^-₃, N₂. Thứ tự giảm dần số oxi hóa của N là:

• N₂ > NO^-₃ > NO₂ > N₂0 > NH⁺₄

• NO₃- > N₂O > NO₂ >N₂ > NH⁺₄

• NO^-₃ > NO₂ > N₂O > N₂ > NH⁺₄

• NO₃ > NO₂ > NH⁺₄ > N₂ > N₂0

Số oxi hóa trong đơn chất luôn bằng:

• 0

• + 1

• - 2

• - 1