Question

$H_{2}S$ is acidic in nature while $H_{2}O$ is neutral in nature. Give reason.

• A. Oxygen is more electro negative than sulphur
• B. $H-S$ bond is weaker than $O-H$ bond
• C. Bond angle in $H_{2}S$ is less than that in $H_{2}O$
• D. $H-S$ bond is stronger than $O-H$ bond

Answer 1

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

$H_{2}S$ is acidic than water because $O-H$ bonds are weaker than $S-H$ bonds. Sulfur is also larger than oxygen, so that helps stabilize the ${SH}^{-}$ anion relative to ${OH}^{-}$.