Question
Acidity of diprotic acids in aqueous solutions increases in the order
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H2S < H2Se< H2Te
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H2Se <H2S <H2Te
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H2Te <H2S < H2Se
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H2Se < H2Te <H2S
Solution
A.
H2S < H2Se< H2Te
Acidic strength of hydrides increases as the size of central atom increases which weakens the M-H bond. Since, the size increases from S to Te thus acidic strength follows the order
H2S <H2Se <H2Te
