Which of the following statements about Rutherford’s model of atom are correct? (i) Considered the nucleus as positively charged. (ii) Established that the a-particles are four times as heavy as a hydrogen atom. (iii) Can be compared to solar system. (iv) Was in agreement with Thomson’s model.

The correct answer is: (a) (i) and (iii)
Rutherford’s model of the atom considered the nucleus as positively charged (i), and it can be compared to the solar system (iii), with electrons orbiting the nucleus like planets orbiting the sun.
The other options are incorrect because:
(ii) is about the mass of α-particles, not part of Rutherford’s atomic model.
(iv) is not correct because Rutherford’s model was a refinement of Thomson’s model, not in complete agreement with it.
Class 9th Science NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.