Assertion :Actinium series is so called because it starts with an isotope of actinium. Reason: Actinium is formed in the nature as such and is not formed from the disintegration of any other radioisotope.

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 D Both Assertion and Reason are incorrect
At one time, it was believed that actinium series starts with $A c - 227$ but now it is well known that it starts with $U - 235$ and $A c - 227$ is one of the main products.

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Assertion :Actinium series is so called because it starts with an isotope of actinium. Reason: Actinium is formed in the nature as such and is not formed from the disintegration of any other radioisotope.

The correct option is D Both Assertion and Reason are incorrectAt one time, it was believed that actinium series starts with Ac−227 but now it is well known that it starts with U−235 and Ac−227 is one of the main products.

The correct option is D Both Assertion and Reason are incorrect
At one time, it was believed that actinium series starts with $A c - 227$ but now it is well known that it starts with $U - 235$ and $A c - 227$ is one of the main products.