Q.

(A) : All natural radioactive elements are ultimately converted to lead.
(R) : All the elements above lead are unstable.

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a

(A) is true but (R) is false

b

Both (A) and (R) are true and (R) is the correct explanation of (A)

c

Both (A) and (R) are false

d

Both (A) and (R) are true and (R) is not the correct explanation of (A)

answer is B.

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Detailed Solution

Lead has the highest mass no element which has a stable nuclei, mass no more than lead are having an unstable nuclei.

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