Very Short Answer Type Questions (1 mark)
1. Define distillation
(CBSE 2012)
2. Why is it not possible to distinguish the particles of the solute from those of solvent
in a true solution?
3. Define chromatography
(CBSE 2019)
4. What happens when a hot saturated solution is cooled?
(CBSE 2012)
6. What is the main difference between aqueous solution and non-aqueous solution?
B. Short Answer Type Questions (2 marks)
1. How will you separate a mixture of two miscible liquids kerosene and petrol? The
difference in their boiling points is less than 25 K. Explain.
(CBSE 2016)
2. What are the two components of a solution? Write two properties of a solution
3. A sugar syrup of mass 214.2 g contains 34.2 g of sugar. Calculate the concentration
of sugar in the syrup.
4. Classify each of the following as element, compound or mixture:
Gold, Air, Marble, Milk, Sugar.
(CBSE 2012)
5. 65 g of glucose is dissolved in 435 g of water. Calculate the concentration of the
solution in terms of mass by mass percentage.
6. How much water should be added to 15 g of salt to obtain 15% salt solution?
(CBSE 2011, 2013)
7. Why does solution of sodium chloride not show Tyndall effect whereas the mixture
of water and milk shows?
8. Compare in tabular form the properties of true solution and colloids with respect to Tyndall effect and stability. (CBSE 2013)
Answers
Answer:
Explanation:1)Distillation is the process of separating the components or substances from a liquid mixture by using selective boiling and condensation.
2)Because the particles of solute dissolve fully in the solution. As a result, it is not possible for us to distinguish the particles of solute from those of solvent in a true solution.
3)Chromatography is a laboratory technique for the separation of a mixture. The mixture is ... chromatography. It is also normally what is needed from the mixture
4)If a saturated solution isheated, then it becomes unsaturated because solubility of solute increases on heating. If a saturated solution is cooled, then some of its dissolved solute will separate out in the form of solid crystals.
6)An aqueous solution is a solution in which water is the solvent. A NaCl solution is an aqueous solution. A non-aqueous solution is a solution in which water is not the solvent. Examples of non-aqueous solutions are solutions used in dry cleaning (a solution of ethene in the solvent dichloromethane).
1)Simple distillation can be used when the temperature difference between the boiling points of two miscible liquid is at least 25oC. The temperature difference between the boiling points of kerosene and petrol is 25oC. Hence, this mixture can be separated using simple distillation
2)A solution has a solvent and a solute as its components. The component of the solution that dissolves the other component in it (usually the component present in larger amount) is called the solvent.
3) Sugar syrup of mass 214.2g contains 34.2g of sugar. Calculate i) molality and ii) mole fraction of sugar in the syrup.
4) gold is element air is mixture marble is compound milk is compound sugar is also a compound. Muxakara and 70 more users found this answer
5)65 g of glucose is dissolved in 435 g of water. calculate the concentration of the solution in terms of mass by percentage.
6)How much water should be added to 15 grams of salt to obtain 15 percent salt solution - 1497192.
7)(a) A solution is a homogeneous mixture that appears clear, such as the ... in a colloid are large enough to scatter light, a phenomenon called the Tyndall effect. ... The protein and synthetic polymer molecules that form colloids may have ... solid, liquid, starch in water, some inks, paints, milk of magnesia, sol.