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Question

Assertion :In Fe2+, 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.

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
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 Fe2+,
Number of protons = 26,
Number of electrons = 24,
Number of neutrons = 30
and, Ionic mass of Fe2+=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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