1.

Assetion In `alpha`-decay atomic number of daughter nucleus reduces by 2 units from the parent nucleus. Reason An `alpha` particle carries four units of mass.A. Both assertin and reason are true and reason is the correct explanation of assertionB. Both assertion and reason are true but reason is not the correct explanation of assertionC. Assertion is true but reason is flaseD. Both assertion and reason are false

Answer» Correct Answer - A
We know that `alpha` particle carries two units of positve charge and four units of mass In `alpha` decays charge number of parent nucleus decreses by 2 units Alos mass number reduces by four units.


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