Question

Which of the following is the correct order of gradually decreasing basic nature of oxides :

• A. ${Al}_2{O}_3,MgO,{Cl}_2{O}_7,{SO}_3$
• B. ${Cl}_2{O}_7,{SO}_3,{Al}_2{O}_3,MgO$
• C. ${SO}_3,{Cl}_2{O}_7,MgO,{Al}_2$
• D. $MgO,{Al}_{2}O,{SO}_3,{Cl}_2{O}_7$

Answer 1

Answer: (D)

$MgO,{Al}_{2}O,{SO}_3,{Cl}_2{O}_7$

Metallic oxides are basic nature. Strength of basicity of oxide decrease with decrease in metallic character. As we move left to right across a period metallic character decreases and hence basic nature of oxides decreases.

So correct order of basic nature of oxides : $MgO>A{l}_2{O}_3>S{O}_3>C{l}_2{O}_7$