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Assertion (A): The discovery of subatomic particles helped in understanding the atomic structure. Reason (R): The number of electrons is equal to the number of protons in an atom. Choose the correct option: (i) Both A and R are true, and R is the correct explanation of A. (ii) Both A and R are true, but R is not the correct explanation of A. (iii) A is true, but R is false. (iv) A is false, but R is true.
View Answer
Answer: (ii)
- Both A and R are true .
- But R (electrons = protons, i.e. neutrality) is not the correct explanation of A (why discovering particles helped understand structure).
Option
Verdict & why
(i)
Both A and R are true, and R is the correct explanation of A.
Incorrect
— R is true, but electron = proton count does not
explain
the discovery of subatomic particles.
(ii)
Both A and R are true, but R is not the correct explanation of A.
Correct answer
— A is true, R is true, but R is an independent fact, not the reason for A.
(iii)
A is true, but R is false.
Incorrect
— R is true: in a neutral atom, electrons equal protons.
(iv)
A is false, but R is true.
Incorrect
— A is true: discovering the electron, proton and neutron built our picture of the atom.
