Which of the following pairs consists of molecules having the same mass number?

  1. A

    H2O and D2O

  2. B

    H2O and HTO

  3. C

    D2O and HTO

  4. D

    D2O and HCl

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    Solution:

    In D2O

    H22 1 O Total mass number of two H 12 isotopes is 4

    In HTO H 1 1 H 3 1 O Total mass number H 11 and H 3 1 isotopes is 4.

     D2O=1+16=20

    HTO=1+3+16=20

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