Which of the following statements are correct? (i) As a result of lanthanoid contraction members ...

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Which of the following statements are correct?
(i) As a result of lanthanoid contraction members of 4 d and 5 d series exhibit similar radii.
(ii) IE_2 is high for Cr and Cu whereas IE_3 is very high for Zn.
(iii) Heavier members of d-block elements like p-block elements favours lower oxidation states.
(iv) In any transition series maximum number of oxidation states is shown by middle elements or elements near middle elements.
(a) (i) and (ii)
(b) (i), (ii) and (iv)
(c) (i), (ii) and (iii)
(d) (ii) and (iv)

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