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Metals react with oxygen to form metal oxides. If the metals considered are K, Cs, Mg and
Sr, the correct order of the basic character of their oxides is 

A.  MgO>SrO>K2O>Cs2O

B.Cs2O < K2O < MgO < SrO

C. MgO<SrO<K2O<Cs2O

D. K2O<MgO<SrO<Cs2O

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Best answer
Answer -: c

Basicity -: alkali metal > alkaline earth metal > transition elements

For k and cs -: on going down the group Basicity increases .

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