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Variable Oxidation States

A transition ...

Question

A transition element X has a configuration $[A r] 3 d^{4}$ , in its +3 oxidation state. Its atomic number is:

A

25

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B

26

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C

22

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D

19

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Solution

The correct option is A 25
In +3 oxidation state $[A r] 3 d^{4}$
So in metallic state $[A r] 3 d^{5} 4 s^{2}$ and metal is Mn (25).

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