Consider the following applications of isotopes: 1. An isotope of Uranium is used as fuel in nuclear reactors. 2. An isotope of Cobalt is used in the treatment of goitre. 3. An isotope of Iodine is used in the treatment of cancer.

The correct option is (a). Explanation Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number. Some isotopes are radioactive and have specific applications in medicine and industry. - Statement 1 is Correct: An isotope of Uranium (specifically U-235) is used as fuel in nuclear reactors to generate electricity through nuclear fission. - Statement 2 is Incorrect: An isotope of Cobalt (specifically Co-60) is used in the treatment of cancer (radiotherapy). It is not used for goitre. - Statement 3 is Incorrect: An isotope of Iodine (specifically I-131) is primarily used in the diagnosis and treatment of goitre (enlargement of the thyroid gland) and other thyroid disorders. While it is used for thyroid cancer specifically, in the context of general science classifications, the standard application for Iodine is goitre, whereas Cobalt is associated with cancer treatment. Key Takeaway: - Uranium-235: Nuclear Fuel. - Cobalt-60: Cancer Treatment. - Iodine-131: Goitre Treatment.

Consider the following applications of… - NCERT Class 9 Science MCQ

NCERT Class 9 Science — Chapter 4: Structure of the atom

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Consider the following applications of isotopes:

An isotope of Uranium is used as fuel in nuclear reactors.
An isotope of Cobalt is used in the treatment of goitre.
An isotope of Iodine is used in the treatment of cancer.

NCERT textbook question

From NCERT Science - class 9 · Page 8

Options

A1 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (a).

Explanation

Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number. Some isotopes are radioactive and have specific applications in medicine and industry.

Statement 1 is Correct: An isotope of Uranium (specifically U-235) is used as fuel in nuclear reactors to generate electricity through nuclear fission.
Statement 2 is Incorrect: An isotope of Cobalt (specifically Co-60) is used in the treatment of cancer (radiotherapy). It is not used for goitre.
Statement 3 is Incorrect: An isotope of Iodine (specifically I-131) is primarily used in the diagnosis and treatment of goitre (enlargement of the thyroid gland) and other thyroid disorders. While it is used for thyroid cancer specifically, in the context of general science classifications, the standard application for Iodine is goitre, whereas Cobalt is associated with cancer treatment.

Key Takeaway:

Uranium-235: Nuclear Fuel.
Cobalt-60: Cancer Treatment.
Iodine-131: Goitre Treatment.

Your note

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