11th Class Chemistry Some Basic Concepts of Chemistry

  • question_answer 82)   In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question. Assertion (A):  The empirical mass of ethene is half of its molecular mass. Reason (R): The empirical formula represents the simplest whole number ratio of various atoms present in a   compound.                                           (a) Both A and R are true and R is the correct explanation of a.                                                  (b) A is true but R is false.                                     (c) A is false but R is true.                                      (d) Both A and R are false.      

    Answer:

        (a) Empirical formula of ethene = \[C{{H}_{2}}\] Empirical formula mass of ethene = 14 amu \[=~\frac{1}{2}x\text{ }molecular\text{ }mass\text{ }of\text{ }ethene\] Empirical formula shows that ethene has (C:H) 1 : 2


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