Question
Assertion

undergoes decays. decays and decays and the daughter product is

Reason

In decay the mass number decreases by and atomic number decreases by In decay the mass number remains unchanged, but atomic number increases by only.

undergoes decays. decays and decays and the daughter product is

A

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

B

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

C

Assertion is correct but Reason is incorrect

D

Both Assertion and Reason are incorrect

Medium
Updated on : 2022-09-05
Solution
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Correct option is A)

After the first two decays the mass number will decrease by and the atomic number will decrease by which will make, 
After the next two decays, the atomic number will increase by 2 units. The product will be, 
After the last two decays, the atomic number and the mass number will remain unchanged.  Final daughter product is
The assertion is therefore correct and the reason is also correct which is the correct explanation for assertion.
The answer is option (A). 

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