Cho một lượng dư KMnO₄ vào 25 ml dung dịch HCl thu được 1,4 lít khí (đktc). Vậy nồng độ mol của dung dịch HCl đã dùng là :

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  soccer                    forward                    nation                     severe

• Choose the best answer for the following sentence:

  A leg injury prevented the footballer from active ______________ in the final tournament.
   

• Choose the best answer for the following sentence:

  It is sport that helps us live _____________.
   

• Choose the best answer for the following sentence:

  In sport, an ________________ is a game which decides which team or player is to go through to the next stage of a particular competition.
  
  

• Choose the best answer for the following sentence:

  ____________ a game in which two teams use their hands to hit a large ball backwards and forwards over a high net without allowing the ball to touch the ground.
  
  

• Choose a word that has different stress pattern:

  steady                 syndrome                   throughout                   tennis

• Choose a word that has different stress pattern:

  serious                     billion                   qualify                     amazing

• Choose a word that has different stress pattern:

  final                    football                       around                      famous

• Choose the best answer for the following sentence:

  The epidemic was so ____________ that the competition had to be cancelled.
  
  

• Choose the best answer for the following sentence:

  The from _____________ the first round will go into the quarter final.