Assertion: It is easy to remove a proton from \[_{20}^{40}Ca\] nucleus as compared to a neutron.
Reason: Inside nucleus neutrons are acted on only by attractive forces but protons are also acted on by repulsive forces.
A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B. Both Assertion and Reason are correct but the Reason is not the correct explanation for Assertion.
C. Assertion is correct but reason is incorrect.
D. Both assertion and reason are incorrect.

Hint: To solve the question, we are going to first analyze the assertion and the reason that are given in the question. Then, the inside of the \[_{20}^{40}Ca\] nucleus is peeked in and the scenario is studied. Then based on the charges that are present on the neutrons and protons, the question is answered.

Complete answer:
A neutron is neutral in charge, hence, there are no repulsive forces acting in between the neutrons inside the nucleus, there are only the attractive forces that keep the neutrons bound inside the nucleus.

However, a proton has the positive charge, so the kind of forces present inside a nucleus between each proton is of repulsive nature, thus, it is easier to remove a proton from the nucleus in comparison with the neutron.

Hence, the assertion that It is easy to remove a proton from \[_{20}^{40}Ca\] nucleus as compared to a neutron is right and the reason for it is that Inside nucleus neutrons are acted on only by attractive forces but protons are also acted on by repulsive forces.

Hence, option A is the correct answer.

Note: The attractive forces that are already present between the neutrons make it very difficult for the external forces to break the bonds and extract the neutrons from inside of a nucleus while on the other hand the repulsive forces already try to keep the protons away hence, it is easier to extract them.