Multiple choice

In mass spectroscopy of water (H2O) peak corresponding to which mass is not possible?

  1. 1

  2. 15

  3. 16

  4. 17

  5. 18
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This answer is correct as when H2O is ionised by the bombardment of electron beam it can get converted to H+, O+, [OH]+, [H2O] having masses 1, 16, 17 and 18 respectively. But none of these configurations give mass of 15. Hence, there can be no peak corresponding to  mass 15.

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