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Assertion: Dalton's Atomic Theory was later modified when the existence of subatomic particles was discovered.
Reason: The discovery of subatomic particles showed that atoms are not indivisible and can be further broken down into smaller particles.
Both assertion and reason are true, and the reason is the correct explanation of the assertion.
Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
The assertion is true, but the reason is false.
The assertion is false, but the reason is true.
Answers (1)
Dalton's Atomic Theory was proposed in the early 19th century, and at that time, it was believed that atoms were indivisible and indestructible. However, as scientists conducted more experiments, they discovered that atoms were not indivisible, and they were made up of smaller subatomic particles, such as protons, neutrons, and electrons. Therefore, Dalton's Atomic Theory was later modified to include the existence of subatomic particles. The assertion is correct, but the reason only partially explains the assertion. While it is true that the discovery of subatomic particles showed that atoms were not indivisible, it does not fully explain why Dalton's theory needed to be modified. The reason for modifying the theory is that the discovery of subatomic particles provided new information that contradicted Dalton's original postulate that atoms are indivisible. Both assertion and reason are correct, but the reason does not fully explain the assertion. Hence option B is the correct answer.
Option (1) is incorrect because it incorrectly states that Both assertion and reason are true, and the reason is the correct explanation of the assertion. Hence option A is incorrect.
Option (3) is incorrect because it incorrectly states that the assertion is incorrect but the reason is correct. The assertion is correct, and the reason is also correct. Hence option C is incorrect.
Option (4) is incorrect because it incorrectly states that both the assertion and reason are incorrect. Both the assertion and reason are correct. Hence option D is incorrect.
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