JEE MAIN - Chemistry (2004 - No. 60)
Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is
SO2 < P2O3 < SiO2 < Al2O3
Al2O3 < SiO2 < P2O3 < SO2
Al2O3 < SiO2 < SO2 < P2O3
SiO2 < SO2 < Al2O3 < P2O3
Explanation
In periodic table from left to right (group $$1$$ to group $$18$$ ) acidic strength increases.
$$Al$$ belongs to group $$13,$$ $$Si$$ belongs to group $$14,$$ $$P$$ belongs to group $$15$$ and $$S$$ belongs to group $$16$$.
So, $$\,\,\,A{l_2}{O_3}$$ will be least acidic and $$S{o_2}$$ will most acidic among then.
So, right order will be
$$A{l_2}{O_3} < Si{O_2} < {P_2}{O_3} < S{O_2}$$
$$Al$$ belongs to group $$13,$$ $$Si$$ belongs to group $$14,$$ $$P$$ belongs to group $$15$$ and $$S$$ belongs to group $$16$$.
So, $$\,\,\,A{l_2}{O_3}$$ will be least acidic and $$S{o_2}$$ will most acidic among then.
So, right order will be
$$A{l_2}{O_3} < Si{O_2} < {P_2}{O_3} < S{O_2}$$
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