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Chemistry MCQ - Atoms and Molecules

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?

There are six kinds of water molecules can be expected on the earth based on different isotopes of hydrogen and oxygen.

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

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.

3 The radioactive isotope of hydrogen is called

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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Question:

Emission of which one of the following will produce isobars?

A. Alpha particles
B. Beta particles
C. Gamma rays
D. X-rays

Correct answer: B

Explanation:

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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