Explanation

• Ozone (O₃) is both beneficial and harmful depending on its location.
• In the Ozone Layer, it protects life by blocking UV rays.
• At ground level, it becomes a pollutant harmful to lungs and plants.
• Thus, it has a dual role in Earth’s atmosphere.

Last verified on 02-05-2026

Explanation

Composition of Air:

• Nitrogen → 78%
• Oxygen → 20.95%
• Argon → 0.93%
• Carbon dioxide → 0.04%
• Other gases → very small traces

Last verified on 30-04-2026

Explanation

• Sugar is the most soluble chemical in water.
• Sugar is made from sucrose.
• Sugar dissolves readily in water due to its polar nature.
• It forms hydrogen bonds with water molecules, increasing solubility.
• Used widely in food and beverages due to easy dissolution.

Last verified on 23-04-2026

Explanation

• Energy due to motion is called kinetic energy.
• Any moving object possesses this energy.
• It depends on mass and velocity of the body.
• Faster motion means more kinetic energy.

Last verified on 11-04-2026

Explanation

• Symbol: Hg
• Atomic number: 80
• Melting point: -38.83 °C
• Atomic mass: 200.59 u

Last verified on 13-03-2026