Final answer:
A saturated solution can become super saturated on cooling, and solubility generally decreases with a decrease in temperature. Silver bromide is a compound made of the elements silver and bromine, and it is a pure substance. Acetone and water are actually miscible liquids, and a mixture of acetone and water can be separated by simple distillation.
Step-by-step explanation:
6. Assertion (A): A saturated solution becomes super saturated on cooling. Reason (R): Solubility decreases with decrease in temperature.
Answer: The statement A is true because a saturated solution can become super saturated on cooling. When a saturated solution is cooled, the solubility of the solute decreases, leading to the formation of excess solute. This excess solute can crystallize out and form a super saturated solution. The statement R is also true because in general, solubility decreases as temperature decreases. When the temperature decreases, the kinetic energy of the solvent molecules decreases, making it more difficult for solute particles to dissolve.
7. Assertion (A): Silver bromide is a compound which is made of the elements silver and bromine. Reason (R): Silver bromide is a pure substance.
Answer: Both statements A and R are true. Silver bromide is indeed a compound made of the elements silver (Ag) and bromine (Br). It has a chemical formula of AgBr. Also, silver bromide is a pure substance because it is made up of only one type of molecule with a definite composition.
8. Assertion (A): Acetone and water are immiscible liquids. Reason (R): A mixture of acetone and water can be separated by simple distillation.
Answer: The statement A is false because acetone and water are actually miscible liquids, meaning they can mix together in any proportion. The statement R is true because a mixture of acetone and water can be separated by simple distillation. Simple distillation takes advantage of the difference in boiling points between the two liquids. Acetone has a lower boiling point than water, so when the mixture is heated, acetone vaporizes first and can be collected separately.