1.

Assertion : Nuclei having number about 60 are most stable. Reason : When two or more light nuclei are combined into a heavier nucleus, then the binding energy per nucleon will increase.

Answer»

If both ASSERTION and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reasonare false.

Solution :The NUCLEI having mass number `A~~60` have MAXIMUM binding energy per nuclean (about 8.7 MEV). So, there nuclei are most STABLE.


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