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Question

Assertion :Isobars are the elements having same mass number but different atomic number. Reason: Neutrons and protons are present inside nucleus.

A
Both assertion and reason are correct and reason is the correct explanation for assertion
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B
Both assertion and reason are correct but reason is not the correct explanation for assertion
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C
Assertion is correct but reason is incorrect
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D
Assertion is incorrect but reason is correct
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Solution

The correct option is B Both assertion and reason are correct but reason is not the correct explanation for assertion
Isobars are the elements having the same mass number but a different atomic number. Isobars have a different number of protons, neutrons and electrons but the sum of protons and neutrons (i.e, the number of nucleons) is same.
Neutrons and protons are present inside nucleus. Electrons are present outside the nucleus.
Hence, both assertion and reason are correct but reason is not the correct explanation for assertion.

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