Question

Assertion(A): The specific charge of $\alpha$ particle is less than ${\mathrm{H}}^{+}$.

Reason(R): Hydrogen has only one proton.

• A. Both A and R are true and R is the correct explanation of A.
• B. Both A and R are true, but R is not the correct explanation of A.
• C. A is true and R is false.
• D. A is false and R is true.

Answer 1

The correct option is D

A is false and R is true.

Explanation for Assertion statement:

1. Specific charge is given by charge and mass ratio. The $\alpha$ particle consists of two protons and two neutrons.
2. Neutrons have the same mass as protons but have no charge.
3. The specific charge of the alpha particles is two times the specific charge of protons.
4. Thus, the assertion statement is wrong.

Explanation for Reason statement:

1. When a hydrogen atom loses an electron, it becomes positively charged (has a charge of +1).
2. It contains only one particle in its nucleus, hydrogen has an atomic number of one.
3. It is the lightest element, having only one proton and an atomic number of one.
4. Hence, the reason is true.

Hence, the correct option is (D); A is false and R is true.