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Solution


Q.

Assertion: Mass number of a carbon is 12.
Reason: Carbon possesses equal number of all three fundamental particles.
1 Assertion and reason both are true and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct, but reason is not the correct explanation of assertion.  
3 Assertion is true, but reason is false.  
4 Assertion is false, but reason is true.  

Ans.

(2)

Number of electrons, protons and neutrons in carbon are equal, i.e.; 6. The mass number of carbon is 12.