Question

Assertion (A): If an atom undergoes a chemical change occurring at a low energy, there is a change in the number of orbital electrons of the atom.

Reason (R): If the atom undergoes a nuclear change which occurs at a high energy, there is a change in the number of nucleons inside the nucleus of the atom.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

• Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

• Assertion (A) is false, but Reason (R) is true.

• Assertion (A) is true, but Reason (R) is false.

Answer 1

Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

Explanation:

Chemical changes take place at low energy and involve only the electrons of an atom, so the number of orbital electrons can change. Nuclear changes take place at very high energy and involve the nucleons (protons and neutrons) inside the nucleus. These are two different processes, so Reason (R) does not explain Assertion (A).