Among A l_2 O_3 ,Si O_2 , P_2 O_3 and S O_2 the correct order of … - Vidyadip

MCQ

Among $A{l_2}{O_3},Si{O_2},{P_2}{O_3}$ and $S{O_2}$ the correct order of acid strength is

A
$A{l_2}{O_3} < Si{O_2} < S{O_2} < {P_2}{O_3}$
B
$Si{O_2} < S{O_2} < A{l_2}{O_3} < {P_2}{O_3}$
C
$S{O_2} < {P_2}{O_3} < Si{O_2} < A{l_2}{O_3}$
✓
$A{l_2}{O_3} < Si{O_2} < {P_2}{O_3} < S{O_2}$

✓

Answer

Correct option: D.

$A{l_2}{O_3} < Si{O_2} < {P_2}{O_3} < S{O_2}$

d
(d) With decrease in size from $Al$ to $S$ the basic nature of oxide decrease and acidic nature increases.

$A{l_2}{O_3} < Si{O_2} < {P_2}{O_3} < S{O_2}$

$A{l_2}{O_3}$ is amphoteric, $Si{O_2}$ is slightly acidic whereas ${P_2}{O_3}$ and $S{O_2}$ are the anhydrides of acids ${H_3}P{O_3}$ and ${H_2}S{O_3}$.

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