Question

Which of the following statements is incorrect?

Breakdown of covalent compounds are enhanced when the polarity of solute and solvent are the same.

Surface area does not affect rate of dissolving.

The rate at which a compound will dissolve and diffuse through the solution is also increased as temperature is increased.

Stirring can be expected to increase the rate of dissolving or dissociation.

Answer 1

Answer: Option (b) is the correct answer.

Step-by-step explanation:

It is known that like dissolves like, that is, polar compounds are soluble in polar solvents and non-polar compounds are soluble in non-polar solvents.

Hence, when polarity is same then it becomes easy to break the bonds.

Whereas when there is increase in surface area of solute particles then more molecules are available for reaction. Therefore, more number of collisions will occur then. As a result, rate of reaction will increase.

On the other hand, when we increase the temperature of a reaction then kinetic energy of molecules also increases. Hence, collisions between the particles also increases which leads to increase in rate of reaction.

Stirring the solution will also increase collisions between the particles. Hence, rate of reaction will also increase.

Thus, we can conclude that out of the given options the following statement is incorrect that surface area does not affect rate of dissolving.

Answer 2

The statement, which is incorrect is this: SURFACE AREA DOES NOT AFFECT THE RATE OF DISSOLVING.
The surface area of a compound affect the rate at which the substance dissolved. The greater the surface area, the faster the substance will dissolve and vice versa. Thus, a powdered substance will dissolve in water faster than a solid substance.