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12/12/2021 2:41 pm
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The numbers of protons, electrons and neutrons in a molecule of heavy water are respectively
(a) 8, 10, 11
(b) 10, 10, 10
(c) 10, 11, 10
(d) 11, 10, 10
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12/12/2021 2:43 pm
Correct answer: (b) 10, 10, 10
Explanation:
Heavy water is D2O hence
number of electrons = 2 + 8 = 10
number of protons = 10
Atomic mass of D2O = 4 + 16 = 20
hence number of neutron = Atomic mass - number of protons
= 20 - 10 = 10