Explanation

• Chlorine is used to kill harmful bacteria.
• This process is called chlorination.
• One of the most common methods of water disinfection. 
• Chlorine is effective because it:
• Kills or inactivates disease-causing microorganisms, such as bacteria, viruses, and parasites.
• It is relatively inexpensive and easy to apply.
• While other methods like ozone and ultraviolet (UV) light are also used for disinfection

Explanation

Explanation

Liquids, such as water, oil, and mercury, are incompressible fluids.

Fluids include gases, which are compressible fluids,

And liquids, which are incompressible or are only slightly compressible.

Explanation

Annealing is carried out to soften the metal.

It makes the metal more suitable for cold working and forming.

It also enhances the metal's machinability, ductility, and toughness.

Annealing is also useful in relieving stresses in the part caused due to prior cold working processes

Explanation

"Combustion of methane" is an example of an exothermic reaction. 

Photosynthesis:

This is an endothermic reaction, meaning it absorbs energy from sunlight to produce glucose. 

Decomposition of calcium carbonate:

This is also an endothermic reaction, as it requires energy to break down calcium carbonate into calcium oxide and carbon dioxide. 

Electrolysis of water:

This is an endothermic reaction where electricity is used to split water into hydrogen and oxygen. 

Explanation

Based on the reactions, the compound that also gives a positive result with both 2,4-DNP and Tollen's agents is Ketone

2,4-Dinitrophenylhydrazine (2,4-DNP) test:

This test is used to detect the presence of a carbonyl group (C=O).

Both aldehydes and ketones have a carbonyl group, so both will give a positive result, forming a yellow, orange, or red precipitate

Tollen's test:

This test is used to differentiate between aldehydes and ketones.

Aldehydes:

Give a positive result with Tollen's agent because they are easily oxidized to form a carboxylic acid.

In this process, the silver ions (Ag^+) in the Tollen's reagent are reduced to metallic silver (Ag(s)), which forms a characteristic "silver mirror" on the inside of the test tube.

Ketones:

Generally do not give a positive Tollen's test because they cannot be easily oxidized.

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

Stainless steel has the best corrosion resistance property. 

Stainless steel:

Due to its high chromium content, stainless steel forms a protective oxide layer on its surface when exposed to oxygen, significantly resisting corrosion. 

Aluminum steel:

While aluminum also forms a protective oxide layer, it is not as resistant to corrosion as stainless steel. 

Carbon steel:

Carbon steel lacks sufficient chromium and is highly susceptible to rusting. 

Explanation

Mass, however, is an extensive property, meaning it depends on the quantity of matter. 

An intensive property is a characteristic that does not depend on the amount of matter present in a system

Density, temperature, and pressure are all intensive properties because they are inherent to the substance itself, regardless of its size.

Explanation

An extensive property depends on the Amount of substance. 

It is a physical quantity that is proportional to the size of the system or the quantity of matter within it.