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Option (3) - 2,3,4 is the answer
(1) cannot be included as Be>B in terms of IE 1
(2) Alkali metals act as strong reducing agents as their ionization energy values are low. Since, ionization decreases on moving down from Li to Cs, the reducing property increases in same order. Thus, Li is the weakest reducing agent while Cs is the strongest reducing agent among alkali metals in free gaseous state.
(3) Ionic mobility is inversely proportional to ionic size
(4) Included in all options so has to be correct
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