Question

$H_{2}O$ is liquid but $H_{2}S$ is gas. This is because of:

• A. larger size of $S$
• B. acidic nature of $H_{2}S$
• C. hydrogen bonding
• D. small size of $O$

Answer 1

The correct option is C hydrogen bonding

$H_{2}S$ (hydrogen sulphide) is a gas because at room temperature the forces and interactions between the molecules of hydrogen sulphide are very weak. The water molecule has a stronger dipole (a negatively and positively charged end to the individual molecule) so these negative and positive ends continually attract each other like magnets of opposite poles, creating more cohesion between the molecules of water--explaining the liquid phase. It also has hydrogen bonding, which boost the attraction.