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Predict the relative acidic strength among the following

(a) H2O, H2 S, H2 Se, H2 Te

(b) H2O < H2 S < H2 Se < H2 Te

(c) H2 Te < H2 Se < H2 S < H2O

(d) H2O < H2 Se < H2 S < H2 Te

1 Answer

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Best answer

Correct option: (a) H2O, H2 S, H2 Se, H2 Te

Explanation:

Assume that each has lost a proton . So we get : HO , HS , HSe , HTe 

It can be easily seen that the volume available for the negative charge is increasing from HO to HTe– , therefore

(i) volume available for the negative charge is increasing from left to right 

(ii) charge density is decreasing from left to right 

(iii) basicity is decreasing from left to right 

(iv) acidity of conjugate acids is increasing from left to right

H2O < H2 S < H2 Se < H2 Te

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