Cho phản ứng hoá học: 4HNO₃ đặc nóng + Cu -> Cu(NO₃)₂ + 2NO₂ + 2H₂O

Trong phản ứng này HNO3 đóng vai trò  

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose one sentence that has the same meaning to the root one:

  You should have more sense of responsibility when you age 18.
  
  

• Choose one sentence that has the same meaning to the root one:

  I have to hurry to he online before 9.00 this morning.
  
  

• Choose one sentence that has the same meaning to the root one:

   “Minh has sent lots of emails to me since we were pen pals, ” said Thanh
  
  

• Choose the word that has the underlined part pronounced differently from the rest:  

  suggest                  burn                 current                     furniture

• Choose the word that has the underlined part pronounced differently from the rest:  

  mountain                mouse                 colour                      plough

• Find a mistake in the four underlined parts of the sentence and correct it:

  The English teacher required so different skills that students need to perfect.

• Find a mistake in the four underlined parts of the sentence and correct it:

  Each year, tourists from all parts of Vietnam travel to Nghe An to visit a birthplace of uncle Ho.

• Find a mistake in the four underlined parts of the sentence and correct it:

  Among the students are many foreigners which attend Vietnamese language class 

  at the center.

• Choose the correct sentence which is built from the words and phrases given:

  what / reason / his change / mind?//.
  
  

• Choose the correct sentence which is built from the words and phrases given:

  I / just complete / two-year bilingual secretarial course/ local college //