MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryp -Block Elements (group 15-18)Previous Year Questions

Acidity of diprotic acids in aqueous solutions increases in the order (CBSE AIPMT 2014)

A.H2S < H2Se < H2Te✓ Correct

B.H2Se < H2S < H2Te

C.H2Te < H2S < H2Se

D.H2Se < H2Te < H2S

Explanation

Acidic strength of hydrides increases as the size of central atom increases which weakens the M–H bond. Since, the size increase from S to Te, thus acidic strength follows the order: H2S < H2Se < H2Te or as we go down the group, acidic strength of hydride increases.

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