Assertion :The emission of $α$ -particles results in the formation of isodiapheres of parent element. Reason: Isodiapheres have same isotopic number.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
$α$ particles do not charge neutron excess. Thus they produce isodiapheres.
Isodiapheres have same nuclear access and not isotope number.
Thus option C is correct.

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Assertion :The emission of α-particles results in the formation of isodiapheres of parent element. Reason: Isodiapheres have same isotopic number.

The correct option is C Assertion is correct but Reason is incorrectα particles do not charge neutron excess. Thus they produce isodiapheres.Isodiapheres have same nuclear access and not isotope number. Thus option C is correct.

Assertion :The emission of $α$ -particles results in the formation of isodiapheres of parent element. Reason: Isodiapheres have same isotopic number.

The correct option is C Assertion is correct but Reason is incorrect
$α$ particles do not charge neutron excess. Thus they produce isodiapheres.
Isodiapheres have same nuclear access and not isotope number.
Thus option C is correct.