Statement I: Alpha particles are the most penetrating radioactive particle.
Statement II: Alpha particles are the smallest of the radioactive particles.

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.

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Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I.

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Statement I is correct, but Statement II is incorrect.

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Both Statement I and Statement II are incorrect.

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Solution

The correct option is D Both Statement I and Statement II are incorrect.
Option D is the correct answer. Both statements are false.
Alpha particles have 2 neutrons and 2 protons. Hence, Alpha particles are not the smallest of the radioactive particles. They have a very very high mass, higher than the Beta particles.
Because of the high mass of the alpha particles, they have a very low penetrating power. Except for long range alpha particles, which have somewhat larger penetration power.

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Statement I: Alpha particles are the most penetrating radioactive particle.Statement II: Alpha particles are the smallest of the radioactive particles.

Statement I: Alpha particles are the most penetrating radioactive particle.
Statement II: Alpha particles are the smallest of the radioactive particles.