Cho 19,2 (g) một kim loại M tan hoàn toàn trong dung dịch HNO₃ thì thu được 4,48 lít khí NO (đktc). Vậy kim loại M là:

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  ______________ known to only a few, his reputation among them is very great.
  
  

• Choose the best answer for the following sentence:

  _______________ was much more exciting than I expected.
   

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

  prohibit                     exhibit                     habit                    hunting

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

  hide                     ivory                     decline                    continent

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

  weapon                    increase                      threat                    spread

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

  elephants                    decades                    poachers                    actions

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

  endangered                     threatened                      recovered                    advanced

• Choose the best answer for the following sentence:

  People have hunted animals ___________ food, hides, and ivory.
   

• Choose the best answer for the following sentence:

  The number of the world’s elephants is restricted ____________ some certain countries.
   

• Choose the best answer for the following sentence:

  A _____________ punishment is necessary to prevent poaching and cutting trees illegally.