Assertion :The mass number of hydrogen is equal to its atomic number. Reason: $H$ -atom has no neutrons.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.

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Assertion is correct, but Reason is incorrect.

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Assertion is incorrect, but Reason is correct.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Hydrogen is the first element of the periodic table and is represented as $_{1}^{1} H$ where the superscript represents its mass number and subscript is the atomic number (number of protons). Therefore both are equal to one.
Also, mass number = number of neutrons (n) + number of protons
$1 = n + 1$ or $n = 0$
Hydrogen has no neutron.
Therefore both statements are correct and the reason is the correct explanation to the assertion.
Hence, the correct option is $(A)$

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