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 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

The percentage of oxygen in the air is about 20.95%.

The air is made up of many gases, including oxygen, nitrogen, argon, and carbon dioxide

***

Nitrogen

Nitrogen is the most abundant gas in the air, making up about 78% of it. 

Argon

Argon is the third most abundant gas in the air, making up about 0.93% of it. 

Carbon dioxide

Carbon dioxide is present in trace amounts in the air, making up about 0.04% of it. 

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

• LPG stand for Liquefied Petroleum Gas
• *****
• In order to supply fuel efficiently to the populace, we have four LPG Storage and Bottling Plants, one each in Karachi, Lahore, Dhurnal, and Akora Khattak.
• LPG is used as a fuel gas in heating appliances, cooking equipment, and vehicles
• LPG is prepared by refining petroleum or "wet" natural gas,
•  LPG was first produced in 1910 by Walter O. Snelling.