Nuclear Chemistry - Result Question 14
Assertion and Reason
Read the following questions and answer as per the direction given below:
(a) Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I
(b) Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I
(c) Statement I is true; Statement II is false
(d) Statement I is false; Statement II is true
14.
Statement I Nuclide ${ } _{13}^{30} Al$ is less stable than ${ } _{20}^{40} Ca$.
Statement II Nuclides having odd number of protons and neutrons are generally unstable.
(1998)
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Answer:
Correct Answer: 14. $(b)$
Solution:
- Upto atomic number of 20 , stable nuclei possess neutron to proton ratio $(n / p)=1$.
$ \begin{aligned} & \frac{n}{p}\left({ } _{13} Al^{30}\right)=\frac{17}{13}=1.3>1, \text { unstable, } \beta \text {-emitters. } \\ & \frac{n}{p}\left({ } _{20} Ca^{40}\right)=\frac{20}{20}=1, \text { stable. } \end{aligned} $
Also, nuclei with both neutrons and protons odd are usually unstable but it does not explain the assertion appropriately.
BETA
