Cho các thí nghiệm sau:         

(a) Dẫn H₂ qua Al₂O₃ nung nóng.         

(b) Điện phân dung dịch CuSO₄ với điện cực trơ.         

(c) Cho mẩu Na vào dung dịch CuSO₄.         

(d) Cho thanh sắt vào dung dịch H₂SO₄ loãng.         

(e) Cho bột kẽm vào dung dịch AgNO₃.         

(g) Nung nóng muối AgNO₃.

Số thí nghiệm mà sản phẩm tạo ra có đơn chất là: 

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

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• Choose the best answer for the following sentence:

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  What an awful day it’s been, _______________ ?
  
  

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  After doing the washing, she hangs up her clothes to make them ____________ .
  
  

• Choose the best answer for the following sentence:

  I ____________ a bath every morning. It is my habit.
  
  

• Choose the best answer for the following sentence:

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

  Studies into life histories show that be a twin can lead to a very difficult life.

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

  Observers / living / Beijing / say / appear / only / small part / one million / habitants/ escape / death / injury//.