Explanation

• LPG stand for Liquefied Petroleum Gas
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• 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.

Explanation

• When a gas turns into liquid, the process is called condensation
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• Condensation - gas to liquid.
• If a gas is cooled, its particles will eventually stop moving about so fast and form a liquid.
• This is called condensation and occurs at the same temperature as boiling.

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Explanation

Carbon monoxide (CO) is a colorless, odorless, and tasteless gas that is produced when coal is burned without sufficient oxygen.

CO is highly toxic.

It can be deadly in high concentrations, as it displaces oxygen in the bloodstream.

Explanation

The usual gases used for lifting airships are hydrogen and helium.

Hydrogen is the lightest known gas and thus has great lifting capacity,

Helium is not as buoyant but is far safer than hydrogen because it does not burn.

Explanation

Explanation

The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.

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

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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

The Sun is primarily made up of hot gases, mainly hydrogen (about 74%) and helium (about 24%),

In a plasma state due to extreme temperatures.

Explanation

 Oxy-acetylene welding:

This is the most common type of gas welding, where oxygen and acetylene are mixed to produce a high-temperature flame that melts the metal pieces to be joined. 

Additional information:

ii. (Acetylene + Carbon):

While acetylene is a key component in gas welding, it needs oxygen to create the combustion necessary for the welding process.

Carbon alone doesn't provide the necessary oxidation. 

iii. (Oxygen + Hydrogen):

Although oxygen is used in welding, hydrogen is not typically used in this context.

Hydrogen and oxygen can form water vapor, which could hinder the welding process. 

Explanation

Graham's Law of Diffusion states that the rate of diffusion of a gas is inversely proportional to the square root of its molar mass.

$$\text{<font color="\#0000ff"><b>Rate</b></font>}<font\; color="\#0000ff"><b>\propto </b></font>\frac{\mathrm{<font\; color="\#0000ff"><b>1</b></font>}}{\sqrt{\mathrm{<font\; color="\#0000ff"><b>M</b></font>}}}$$

Compare molar masses:

CH₄ (Methane): 16 g/mol

N₂ (Nitrogen): 28 g/mol

O₂ (Oxygen): 32 g/mol

H₂ (Hydrogen): 2 g/mol (lightest)

Since H₂ has the smallest molar mass, it diffuses the most rapidly.