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Q.

Assertion (A): Oxidation number of magnesium is +2  in its compounds.

Reason (R): Magnesium gains two electrons. 

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a

A is correct and R is incorrect.

b

Both A and R are correct and R is correct explanation of A.

c

A is incorrect and R is correct.

d

Both A and R are correct but R is not correct explanation of A.

answer is C.

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Detailed Solution

Mg is a IIA group element, so it lose 2 electrons. Mg oxidation number is  +2 in its compounds.

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