[CPMT 1977, 83]
A) $ Al_2O_3 $
B) $ MgO $
C) $ SiO_2 $
D) $ P_2O_5 $
Correct Answer: B
$ \underbrace{MgO} _{Basic}\underbrace{Al_2O_3} _{Amphoteric}\underbrace{SiO_2P_2O_5} _{Acidic} $
$ MgO+H_2O\to Mg{(OH)} _2 $ Base or alkali
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