Classification Of Elements And Periodicity In Properties Question 87
Question: Among $ Al_2O_3 $ , $ SiO_2 $
$ P_2O_3 $ and $ SO_2 $ the correct order of acid strength is
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 $
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Answer:
Correct Answer: D
Solution:
[d] With decrease in size from A1 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 $ SiO_2 $ are the anhydrides of acids $ H_3PO_3 $ and $ H_2SO_3 $
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