Assertion: The mass number of hydrogen is equal to its atomic number.
Reason: Hydrogen atom is devoid of neutron.

Assertion is correct but the reason is incorrect

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Assertion is incorrect but the reason is correct

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Both assertion and reason are correct but reason is not the correct explanation for the assertion

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Both assertion and reason are correct and the reason is the correct explanation for the assertion

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Solution

The correct option is D Both assertion and reason are correct and the reason is the correct explanation for the assertion
Atomic number is the number of protons and mass number is the sum of number of protons and neutrons in the nucleus of the atom.
Hydrogen atom has only one proton, one electron and no neutron. Since hydrogen is devoid of neutron, the mass number of hydrogen is equal to its atomic number; that is 1.

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