• # question_answer The order in which the following oxides are arranged according to decreasing basic nature is [CPMT 1985] A) $N{{a}_{2}}O,\,MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO$ B) $MgO,\,A{{l}_{2}}{{O}_{3}},\,CuO,\,N{{a}_{2}}O$ C) $A{{l}_{2}}{{O}_{3}},\,MgO,\,CuO,\,N{{a}_{2}}O$ D) $CuO,\,N{{a}_{2}}O,\,MgO,\,A{{l}_{2}}{{O}_{3}}$

$N{{a}_{2}}O,\,\,MgO,\,\,A{{l}_{2}}{{O}_{3}},\,\,CuO$. More the metallic character higher the ${{e}^{-}}$ donating tendency. Therefore lower the I.E. more the basic nature of oxide.