Thực hiện các thí nghiệm sau:

(1) Đốt dây sắt trong khí clo.

(2) Đốt cháy hỗn hợp sắt và lưu huỳnh (trong điều kiện không có không khí).

(3) Cho sắt (II) oxit vào dung dịch axit sunfuric đặc nóng.

(4) Cho sắt vào dung dịch đồng (II) sunfat.

(5) Cho đồng vào dung dịch sắt (III) clorua.

(6) Cho oxit sắt từ tác dụng với dung dịch axit clohidric.

Số thí nghiệm tạo ra muối sắt (II) là:         

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  He asked me ________________.

   

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

  It were they that built this hotel 2 years ago.

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

  It is Tom that has admitted to steal my watch.

• Choose the best answer for the following sentence:

  He asked me ___________ .

   

   

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

  These are the data collecting during our survey trip.

• Choose the best answer for the following sentence:

  John said that he ______________ for that company for ten years.

   

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

  It is under the bed that there are a pair of shoes.

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

  It is cooking that I am tired with.

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

  Despite his illness, he took part in the Green Summer volunteer campaign.

   

   

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

  It was Linda and Martin that I often go to the cinema with.