MCQ
Which of the following is arranged in decreasing order of size?
- A$Mg^{2+} > Al^{3+} > O^{2-}$
- ✓$O^{2-}> Mg^{2+} > Al^{3+}$
- C$Al^{3+} >Mg^{2+} >O^{2-}$
- D$Al^{3+} >O^{2-}>Mg^{2+}$
✓
Answer
Correct option: B.
$O^{2-}> Mg^{2+} > Al^{3+}$
b
Size $\propto \frac{\text { Negative charge }}{\oplus \text { ve charge }}$
Size $\propto \frac{\text { Negative charge }}{\oplus \text { ve charge }}$
$O^{2-} \,>\,Mg^{+2} \,>\, Al^{+3}$
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