Question

Assertion: The sum of protons and neutrons is always different in isobars.

Reason: Isobars are atoms of different elements having same mass number but different atomic number.

• A. Both assertion and reason are true and the reason is a correct explanation of the assertion
• B. Both assertion and reason are true but reason is not a correct explanation of the assertion.
• C. Assertion is true but the reason is false
• D. Assertion is false but the reason is true
  
• E. Both the assertion and reason are false
  

Answer 1

The correct option is D Assertion is false but the reason is true

Isobars are atoms of different elements having same atomic mass but different atomic number.

Atomic mass is the sum of neutrons and protons so if atomic mass of two atoms are same. So the sum of protons and neutrons will definitely be same.