Question

Assertion : `alpha`-particle is a helium nucleus.
Reason : In `alpha`-decay, both the mass number as well as atomic number of the daugther is more than that of parent.
A. If both, Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B. If both, Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
C. If Assertion is true but the Reason is false.
D. If both Assertion and Reason are false.

Answer 1

Correct Answer - C
Assertion is true, but the Reason is false. When `alpha`-decay takes place, both the mass number and atomic number decreases. In general, `alpha` -decay is represented as `._(Z)X^(A)to._(Z-2)Y^(A-4)+._(2)He^(4)`+energy where X is the present nucleus and Y is the daugther nucleus.