Question

$H_{2}S$ is gas while $H_{2}O$ is liquid. Why?

Answer 1

• In $H_{2}O$ there is hydrogen bonding because oxygen has a high electronegativity.
• So, the hydrogen atoms from other molecules of water form a hydrogen bonds with oxygen resulting in intermolecular hydrogen bonding.
• 
  
• Therefore at room temperature, $H_{2}O$ is a liquid and $H_{2}S$ is a gas.