Question

`H_2S` is more acidic than `H_2O`. The reason is
A. `O-H` bond is stronger than `S-H` bond
B. `O` is more electronegative than S
C. `H-S` bond is weaker than `O-H` bond
D. `O-H` bond is weaker than `H-S` bond

Answer 1

Correct Answer - A::C
To release `H^(+)` (proton), the `H-E` (E stands for element which may be O or S) bond must be broken. On account of relatively large size of S atom, the `H-S` bond is weaker than the `O-H` bond and, hence, easy to break.