Question

Oxygen is more electronegative than sulphur, yet $H_{2}S$ is acidic while $H_{2}O$ in neutral. This is because

• A. water is a highly associated compound
• B. $H-S$ bond is weaker than $H-O$ bond
• C. $H_{2}S$ is a gas while $H_{2}O$ is a liqiud
• D. the molecular weight of $H_{2}S$ is more than that of $H_{2}O$

Answer 1

The correct option is B $H-S$ bond is weaker than $H-O$ bond

Electronegativity of oxygen is more than sulphur and so, $H-O$ bond is stronger than $H-S$ bond. $H-S$ bond easily donates proton.

Hence, $H_{2}S$ is more acidic than $H_{2}O$.