A) \[A{{l}_{2}}{{O}_{3}}<MgO<N{{a}_{2}}O<{{K}_{2}}O\]
B) \[MgO<{{K}_{2}}O<A{{l}_{2}}{{O}_{3}}<N{{a}_{2}}O\]
C) \[N{{a}_{2}}O<{{K}_{2}}O<MgO<A{{l}_{2}}{{O}_{3}}\]
D) \[{{K}_{2}}O<N{{a}_{2}}O<A{{l}_{2}}{{O}_{3}}<MgO\]
Correct Answer: A
Solution :
On moving across a period ionisation energy increases hence the electropositive nature of metals decreases therefore the ease of formation of ion also decreases and hence the basic character decreases. Further basic character of alkali metals oxides increases from \[L{{i}_{2}}O\] to \[C{{s}_{2}}O\]hence the correct order will be \[A{{l}_{2}}{{O}_{3}}<MgO<N{{a}_{2}}O<{{K}_{2}}O\]
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