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Q.

Out of the following transition elements, the maximum number of oxidation states are shown by

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a

Sc (Z = 21)

b

Cr (Z = 24)

c

Mn (Z = 25)

d

Fe (Z = 26)

answer is C.

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Detailed Solution

Manganese shows maximum number of oxidation states because it has 5 unpaired electrons in 3d and also contains 2 electrons in 4s sub-shell. + 2, + 3 ,+ 4 ,+ 5, + 6 ,+ 7

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