Predict The Relative Acidic Strength Among The Following H2O, H2S, H2Se, H2Te

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Question

diffcult

Correct option is

H₂O < H₂S < H₂Se < H₂Te

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 < H₂S < H₂Se < H₂Te.