Question

Assertion: A mixture of salt and ice gives temperature below $0^\circ C$.
Reason: The salt raises the freezing point of ice.
A.Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
B.Both Assertion and Reason are correct and Reason is not the correct explanation for Assertion.
C.Assertion is correct but Reason is incorrect.
D.Assertion is incorrect but Reason is correct.

Answer 1

To absorb the heat from a component (component can be liquid, or solid, or both) of the system, a combination of substances is formed. This combination of substance lowers the temperature by absorbing the heat.

Complete answer:
According to Merriam-Webster dictionary, Assertion is a declaration that something is the case. Reason should justify the declaration.
In the given question, freezing mixture is the mixture of salt and ice that decreases the freezing point of ice. The temperature drops to $0^\circ C$ and can go lowest up to $- 21^\circ C$.
We conclude that the freezing point gets lowered when salt and ice are taken into consideration.
Hence, the reason does not support the assertion and is fundamentally incorrect.

So, option C., that is, assertion is correct but reason is incorrect, is the right choice for the given question.

Note:
This process is used to remove the snow from the roads. The salt is sprinkled in the areas, thickly covered with snows. This reduces the freezing point and snow converts into liquid state (water) and traffic moves smoothly and people can do their work without any chaos.
We wonder which kind of salt is used to do such work. Some may say the table salt, well it is true but there is an addition to this list.
The salt used to remove ice from the roads/streets is Calcium Chloride. That’s why, In winters, people along with the authorities, pour salt on icy sidewalks.