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Q.

Among ${Al}_{2} O_{3}, {SiO}_{2}, P_{2} O_{3}$ and ${SO}_{2}$ the correct order of acid strength is

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a

${SiO}_{2} < {SO}_{2} < {Al}_{2} O_{3} < P^{2} O_{3}$

b

${SO}_{2} < P_{2} O_{3} < {SiO}_{2} < {Al}_{2} O_{3}$

c

${Al}_{2} O_{3} < {SiO}_{2} < {SO}_{2} < P_{2} O_{2}$

d

${Al}_{2} O_{3} < {SiO}_{2} < P_{2} O_{3} < {SO}_{2}$

answer is D.

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Detailed Solution

Across the period electronegativity increases, acidic character increases

Al₂O₃ < SiO₂ < P₂O₃ < SO₂

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