Explanation

Explanation

Argon is a commonly used gas used to fill incandescent light bulbs.

It increases bulb life by preventing the tungsten filaments from deteriorating too quickly.

Other gases are also used in lighting such as:

• Helium
• Neon
• Nitrogen
• Krypton

Explanation

The Contact process is a well-established industrial method for producing sulfuric acid.

Sulfur dioxide is oxidized to sulfur trioxide with the help of a catalyst, which then reacts with water to form sulfuric acid. 

Explanation

Water is present beneath the Earth's surface in soil pore spaces and rock formations.  

- Source:

Comes from rainwater, rivers, and lakes that seep into the ground.  

- Storage:

Stored in aquifers (permeable rock layers).  

- Uses:

Drinking water, irrigation, and industrial use.  

- Movement:

Moves slowly through soil and rocks due to gravity and pressure.  

- Recharge:

Replenished by rainfall and surface water infiltration.  

- Importance:

Major source of fresh water, especially in dry areas.  

- Contamination:

Can be polluted by chemicals, waste, affecting health.

Explanation

Mercury is a chemical element

It is commonly known as quicksilver. 

It is the only metal to remain in liquid form at room temperature.

Droplets of liquid mercury are shiny and silver-white with a high surface tension, appearing rounded when on flat surfaces

Explanation

Explanation

Explanation

Explanation

Blood type O has no A or B antigens on the surface of red blood cells.

That's why type O is known as the universal donor in blood transfusion.

Explanation