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Acidity of diprotic acids in aqueous solutions increases in the order:

1. H2S < H2Se < H2Te
2. H2Se < H2S < H2Te
3. H2Te < H2S < H2Se
4. H2Se < H2Te < H2S

Correct answer: H2S < H2Se < H2Te

Solution

The acidity of diprotic acids increases down the group in the periodic table due to the decreasing bond strength and increasing size of the central atom, making it easier to release H+ ions. Hence, H2S < H2Se < H2Te.

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