Assertion :All the radioactive elements are ultimately converted to lead. Reason: All the elements above lead are unstable.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
A
Lead has the highest atomic number for stable elements. So any elements above lead are unstable and can decay in some form or another, once a decay happens that results in lead there is no more decay. Elements above lead can decay to something other than lead too but apparently, some it is the highest atomic number of stable elements, it is more likely that the decay resulting in a stable element will land on lead.

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Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
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