Question

ASSERTION :When a crystal is added to a supersaturated solution of itself, the crystal does not appear to change.
REASON : The supersaturated solution is holding more solute than its normal solubility
A. Both Assertion and Reason arc correct and Reason is the correct explanation for Assertion
B. Both Assertion and Reason arc correct but Reason is not the correct explanation for Assertion
C. Assertion is not correct but Reason is correct
D. Both Assertion and Reason are incorrect

Answer 1

Hint: We know that a crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

Complete step by step answer:
Let’s understand supersaturated solutions. It is a solution in which more solute is dissolved than is necessary to make a saturated solution.
The assertion is “when a crystal is added to a supersaturated solution of itself, the crystal does not appear to change”. It is false as when a crystal is added to a supersaturated solution of itself, it will result in immediate crystallization.

Crystallisation is the process of formation of crystals. It leads to Physical Changes in a Material.
The reason given in the question is the supersaturated solution is holding more solute than its normal solubility. It is correct as the crystals added in the saturated solutions, will immediately precipitate out.

Hence the correct answer is C, that is, Assertion is not correct but Reason is correct

Additional information:
Let’s discuss the crystallization process. It is the process in which formation of a solid takes place where molecules or atoms are highly organized into a structure known as crystal. There are many ways of making crystals, such as, precipitation of a solution, deposition directly from gas etc.

Note: Read the assertion carefully as it may confuse you to mark it as correct because there is no chemical change by adding crystals in a supersaturated solution, but as discussed above there are physical changes observed.