Q. Which of the following statements is/are correct?
1.An isotope of uranium is used as a fuel in nuclear reactors.
2.An isotope of cobalt is used in the treatment of cancer.
3.An isotope of iodine is used in the treatment of goitre.
Choose the correct answer from below given codes:

[A] 1 only

[B] 1 and 2 only

[C] 2 and 3 only

[D] 1, 2 and 3

Answer: D
Notes:

Explanation: Since the chemical properties of all the isotopes of an element are the same, normally we are not concerned about taking a mixture. But some isotopes have special properties which find them useful in various fields. Some of them are:

  1. An isotope of uranium is used as a fuel in nuclear reactors.
  2. An isotope of cobalt is used in the treatment of cancer.
  3. An isotope of iodine is used in the treatment of goitre.

Source: Science NCERT