Explanation

Normal salts are formed when all replaceable hydrogen atoms in an acid are replaced by metal ions.

They do not contain any replaceable hydrogen or hydroxyl groups.

Explanation

Conductivity is a physical property that describes how well a material allows heat or electricity to pass through.

Reactivity and toxicity are chemical properties, as they involve changes in the substance's composition.

Explanation

A dilute solution contains a relatively small amount of solute compared to the solvent.

This means the solute is less concentrated in the solution.

Explanation

Expansion of metal on heating is a physical change because it does not alter the metal’s chemical composition.

When cooled, the metal returns to its original size, showing that the change is reversible.

Explanation

A catalyst speeds up the rate of reaction but does not affect the position of equilibrium.

Temperature, pressure, and concentration can shift the equilibrium position of a reversible reaction.

Explanation

Explanation

Sublimation is the process in which water vapour directly condenses into solid form.

Condensation is the process of transformation of water vapour into water.

Evaporation is process by which water or a liquid is transformed from liquid to gaseous state.

Precipitation is the condensation of water vapor in air in form of water droplets or ice.

Explanation

Biogas is a type of natural gas produced through the anaerobic digestion of organic matter.

Such as animal manure and food waste.

It primarily consists of methane and carbon dioxide.

Explanation

Natural rubber is made primarily of cis-1,4-polyisoprene, a polymer of the isoprene monomer.

It is harvested from the latex of rubber trees and processed into polyisoprene, which gives rubber its elasticity.

Explanation

Soaps are alkaline.

It often contain basic substances like sodium hydroxide, which can irritate or burn the eyes.

These bases disrupt the eye's natural pH, causing a stinging or burning sensation.