The correct statements about the transition elements is/are

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Transition elements of 3d series have almost same atomic sizes from Cr to Cu

the stability of +2 oxidation state increases across the period

The most stable oxidation state is +2 and its stability decreases across the period

Some transition elements like Ni, Fe, Cr may show zero oxidation state in some of their compounds

answer is C.

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Detailed Solution

The most common oxidation state of transition elements is +2 which achieves after losing two electrons from outermost s-subshell. Therefore, the stability +2 cannot decreases across the period.

The atomic size increases along the period because the number of electrons is added in the same subshell and this results in increasing the effective nuclear charge on the valence electrons.

Ni, Fe, and Cr have zero oxidation state only in their standard state respectively. With compounds, they never be in zero oxidation state.

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