Question

Which of the following statements are correct?

I. An isotope of iodine is used in the treatment of goitre.

II. Protium is an isotope of hydrogen having only one neutron.

III. An isotope of uranium is used as a fuel in nuclear reactor.

• A.
  I and II
• B.
  I and III
• C.
  II and III
• D.
  I, II and III

Answer 1

The correct option is B

I and III
Isotopes are defined as the atoms of the same element, having the same atomic numbers but different mass numbers.

Hydrogen has three isotopes, namely protium, deuterium and tritium. Protium is represented as ${}_1^{1}H$ and has one proton, zero neutron and one electron.

Some isotopes have special properties which are found useful in various fields. Iodine-131 radioisotope helps in the treatment of goitre by tracing how and at what rate the thyroid gland intakes the iodine (which is essential for making thyroxine hormone) in our body.

Uranium-235 isotope is used as a fuel in the reactors of nuclear power plants for generating electricity.

Hence, the correct answer is option (b).