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9th Class Science Atoms and Molecules Question Bank 9th CBSE Science Atoms and Molecules

  • question_answer
      Valency of an element X is 3. Write the chemical formula of its oxide.

    Answer:

                      Atomic mass of carbon = 12 u Atomic mass of oxygen = 16 u Therefore, one atom of carbon istimes heavier than one atom of oxygen.   (2,3 marks)  


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