Assertion (A) Fragments produced in the fission of `""_(92)U^(235)` are radioactive.
Reason (R) The fragments in the fission of `""^(235)U` have a proton to neutron ratio of 2.5.

Options

A. Both (A) and (R) are correct and (R) is the correct explanation of (A).
B. Both (A) and (R) are correct but (R) is not the correct explanation of (A).
C. (A) is correct but (R) is not correct.
D. (A) is not correct but (R) is correct.

Answer

C

Explanation

Nuclear fission of `""_(92)U^(235)` is expressed as
`""_(92)U^(235)+""_(0)n^(1) rarr ""_(56)Ba^(141)+""_(36)Kr^(92)+3n^(1)+Q`
As, fission by product of `""_(92)U^(235)` are `""_(56)Ba^(141) " and "_(36)Kr^(52)`, which both are slightly radioactive.
The ratio of proton to neutron of `""_(56)Ba^(141)`.
`" "X_(Ba)=56/((141-56))=0.65`
Similarly, the ratio for `""_(36)Kr^(92)`.
`" "X_(kr)=36/(92-36)=36/56=0.64`
Hence, the assertion (A) is correct but reason (R) is not correct.