Classification Of Elements And Periodicity In Properties Question 303
Question: Among $ Al_2O_3,SiO_2,P_2O_3 $ and $ SO_2 $ the correct order of acid strength is [AIEEE 2004]
Options:
A) $ Al_2O_3<SiO_2<SO_2<P_2O_3 $
B) $ SiO_2<SO_2<Al_2O_3<P_2O_3 $
C) $ SO_2<P_2O_3<SiO_2<Al_2O_3 $
D) $ Al_2O_3<SiO_2<P_2O_3<SO_2 $
Show Answer
Answer:
Correct Answer: D
Solution:
With decrease in size from Al to S the basic nature of oxide decrease and acidic nature increases. $ Al_2O_3<SiO_2<P_2O_3<SO_2 $
$ Al_2O_3 $ is amphoteric, $ SiO_2 $ is slightly acidic whereas $ P_2O_3 $ and $ SO_2 $ are the anhydrides of acids $ H_3PO_3 $ and $ H_2SO_3 $ .
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