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Standard IX
Chemistry
Question

Which of the following pairs are isotopes?
  1. Oxygen and Ozone
  2. Nitric oxide and Nitrogen dioxide
  3. Hydrogen and Deuterium
  4. Ice and Steam

A
Oxygen and Ozone
B
Ice and Steam
C
Nitric oxide and Nitrogen dioxide
D
Hydrogen and Deuterium
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Solution
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Isotopes are elements with same atomic number but different mass number. Hydrogen and Deuterium are isotopes with same atomic number but different mass number. Hydrogen have atomic number 1 and mass number 1 where as deuterium have atomic number 1 but mass number 2.

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