Question

Assertion : Nuclear isomers have same atomic number and same mass number but with different radioactive properties.
Reason : $U_{\left(A\right)}and{U}_{\left(Z\right)}$ are nuclear isomers.

• A. If both (A) and (R) are correct, and (R) is the correct explanation of (A).
• B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
• C. If (A) is correct, but (R) is incorrect.
• D. If (A) is incorrect, but (R) is correct.
• E. If both (A) and (R) are incorrect.

Answer 1

The correct option is A If both (A) and (R) are correct, and (R) is the correct explanation of (A).

Assertion : Nuclear isomers have same atomic number and same mass number but with different radioactive properties.
Reason : $U_{\left(A\right)}and{U}_{\left(Z\right)}$ are nuclear isomers. They have different half life periods of 1.4 min and 6.7 hours. The nuclei have different energy states. One may be in the ground state and other may be in the excited state. This gives rise to different half life periods and nuclear isomerism.
Thus both (A) and (R) are correct, and (R) is the correct explanation of (A).