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Assertion : After emission of one alpha-...

Assertion : After emission of one `alpha`-particle and two `beta`-particles, atomic number remains unchanged.
Reason : Mass number changes by four.

A

(a) If both Assertion and Reason are true and Reason is correct explanation of the Assertion.

B

(b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C

(c) If Assertion is true, but the Reason is false.

D

(d) If Assertion is false but the Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
B
By emission of one `alpha`-praticle, atomic number decreases by 2 and mass number by 4. But by the emission of one `beta`-particle, atomic number increases by 1 and mass number remains unchanged.
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