Assertion :In $F e^{2 +}$ , there are $24$ electrons and $30$ neutrons and thus, ionic mass is $56$ . Reason: Ionic mass = No. of neutrons + No. of protons; No of protons = No. of electrons in neutral species.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In $F e^{2 +}$ ,
Number of protons = $26$ ,
Number of electrons = $24$ ,
Number of neutrons = $30$
and, Ionic mass of $F e^{2 +} = 56$ g/mol.

Therefore, Ionic mass = No. of neutron + no. of proton

Also, no. of the electron in a neutral species = No. of proton

Hence, option A is correct.

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