Correct order is :- – InterviewSolution

1.	Correct order is :-
Answer» `MgO lt NIO lt K_(2) O ltCs_(2)O` (basic strength) ` Cs^(+) LTK^(+)ltMg_(2) ^(+) Be_(2) ^(+) ` (IONIC mobility in aqueous solution `Li_(2) CO_(3)lt Na _(2) CO_(3)lt K_(2) CO_(3)`(solubility ORDER) `NH_(3) lt PH_(3)lt AsH_(3) `(thermal stability) Answer :C

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