Explanation

Ozone (O₃) is a triatomic molecule of oxygen, not a noble (rare) gas.

Radon, Xenon, and Krypton are all noble gases found in Group 18 of the periodic table.

Explanation

Diamond is a non-metal with a high-density.

Graphite: A non-metal but has a lower density (~2.2 g/cm³).

Hydrogen: The lightest element with very low density (~0.000089 g/cm³).

Helium: Also very low density (~0.00018 g/cm³).

Diamond: A non-metal form of carbon with high density (~3.5 g/cm³).

Iron: A metal, so not a valid choice for a non-metal category.

Explanation

Nitrogen dioxide (NO₂) and Sulphur dioxide (SO₂) dissolve in rainwater to form nitric acid and sulphuric acid, causing acid rain.

These gases are mainly released from burning fossil fuels.

Explanation

Carbon monoxide (CO) is a poisonous gas that is emitted from the engine of an automobile.

The smoke released from the automobile is due to the combustion of fuels like petrol and diesel.

Explanation

Gases fill all the space available to them by expanding to take the shape and volume of their container.

Unlike solids and liquids, gases have no fixed shape or volume.

Explanation

Gas molecules have very weak forces of attraction already, so breaking them does not require much energy.

Thus, "Less energy is required..." is NOT a unique characteristic describing their general behavior compared to solids or liquids.

Explanation

Nitrogen gas slows burning, rusting, and decay by preventing oxidation.

Plants use nitrogen in fertilizers for growth.

Animals use nitrogen to form proteins, which are essential for life.

Nitrogen gas itself is not directly used in baking; instead, carbon dioxide or other gases are used for leavening.

Explanation

Neon gas emits a bright glow when electrified, making it ideal for advertising signs.

It produces red-orange light but can create different colors when mixed with other gases.

Explanation

• A dry chemical Fire extinguisher can be used on all types of fire
• ***
• An ABC or Multi-Purpose Dry Chemical portable fire extinguisher is useful for Class A, B, and C fires.
• These units can be used on wood, paper, cloth, trash, flammable liquids, and energized electrical equipment.
• ***

• extinguishers بجھانے والے

  Carbon dioxide is used in fire ‘extinguishers’

  
  

Explanation

Methane (CH₄) is produced during the anaerobic fermentation of biomass.

It is the main component of biogas.

It is widely used as a renewable energy source.