1. Taking into account, three isotopes of hydrogen and three isotopes of oxygen occurring in nature, how many different kinds of water molecules can we expect on the Earth?

  • Option : A
  • Explanation : (A) There are six kinds of water molecules can be expected on the earth based on different isotopes of hydrogen and oxygen.

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2. Emission of which one of the following will produce isobars?

  • Option : B
  • Explanation : (B) Atoms of different elements having same mass numbers but different atomic numbers are called isobars. Isobar is formed due to beta emission of a radioactive element.

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3. The radioactive isotope of hydrogen is called

  • Option : D
  • Explanation : (D) Hydrogen has three main isotopes, there are protium (1H) deuterium (2H) and tritium (3H). Protium and deuterium are stable while tritium is radioactive and has a half-life of about 12 years

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