Which of the following statement is correct for s-block elements :-...

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Which of the following statement is correct for s-block elements :-
\( \mathrm{P} \)
(A) Be has smallest atomic size in II A group
W
(B) \( \mathrm{Li} \) is most metallic
(C) \( \mathrm{Mg} \) impart red colour to the flame
(D) Cs is most reducing in water
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