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Which statements are incorrect?...

Which statements are incorrect?

A

`IE_(1)` of Ln are around `600kJ`, the second about `1200kJ` comparable to that of calcium

B

`E^(ө)` for `Ln^(3+)+3e^(-) to Ln_((s))` varies from `-2.2V` to `-2.4V` except `Eu(-2.0V)`

C

`Sm^(2+)` and `Yb^(2+)` are good reductants

D

Chemical twins are also formed due to actinoid contraction

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