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Compare evaporation, crystallization and distillation. In which situation, would you prefer each of these over the others?
Evaporation is preferred when the aim is to obtain a solute, such as salt and the solvent is not required. Crystallization is preferred when a desired pure solid must be obtained from a solution containing impurities. Distillation is preferred when the solvent must also be recovered or when two miscRead more
Evaporation is preferred when the aim is to obtain a solute, such as salt and the solvent is not required. Crystallization is preferred when a desired pure solid must be obtained from a solution containing impurities. Distillation is preferred when the solvent must also be recovered or when two miscible liquids with sufficiently different boiling points need to be separated.
For more NCERT Solutions of Class 9 Science Exploration Chapter 5 Exploring Mixtures and their Separation Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-5/
See lessTwo miscible liquids, A and B, are present in a mixture. The boiling point of A is 60 °C and the boiling point of B is 90 °C. Suggest a method to separate them. Also, draw a labelled diagram of the method suggested.
Distillation should be used because A and B are miscible liquids and their boiling points differ by 30 °C, which is more than the approximately 25 °C difference suitable for distillation. On heating, liquid A with the lower boiling point of 60 °C vaporises first. Its vapour passes through the condenRead more
Distillation should be used because A and B are miscible liquids and their boiling points differ by 30 °C, which is more than the approximately 25 °C difference suitable for distillation. On heating, liquid A with the lower boiling point of 60 °C vaporises first. Its vapour passes through the condenser, where it cools and changes back into liquid, which is collected separately.
For more NCERT Solutions of Class 9 Science Exploration Chapter 5 Exploring Mixtures and their Separation Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-5/
See lessAssertion (A): Solutions do not exhibit the Tyndall effect. Reason (R): The particles in solutions are larger than 100 nm, so they cannot scatter light. Choose the correct option: (i) Both A and R are true and R is the correct explanation of A. (ii) Both A and R are true, but R is not the correct explanation of A. (iii) A is true, but R is false. (iv) A is false, but R is true.
Option iii is correct. Assertion A is true because scattering of light occurs in colloids and suspensions but not in transparent solutions. Reason R is false because particles in a solution are the smallest, having a diameter less than 1 nm. Therefore, they cannot scatter light sufficiently to produRead more
Option iii is correct. Assertion A is true because scattering of light occurs in colloids and suspensions but not in transparent solutions. Reason R is false because particles in a solution are the smallest, having a diameter less than 1 nm. Therefore, they cannot scatter light sufficiently to produce the Tyndall effect. The statement that solution particles are larger than 100 nm is incorrect.
For more NCERT Solutions of Class 9 Science Exploration Chapter 5 Exploring Mixtures and their Separation Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-5/
See lessThe label on a cooking oil pack says one litre (910 g). If this oil is mixed with water, will it form a separate layer? If so, which substance will be on top? How will you separate the two layers? Also, draw the diagram of the apparatus used.
Yes, cooking oil and water form two separate layers because they are immiscible liquids. One litre of oil has a mass of 910 g, so it is less dense than water. Therefore, oil forms the upper layer and water forms the lower layer. The layers can be separated using a separating funnel by opening the stRead more
Yes, cooking oil and water form two separate layers because they are immiscible liquids. One litre of oil has a mass of 910 g, so it is less dense than water. Therefore, oil forms the upper layer and water forms the lower layer. The layers can be separated using a separating funnel by opening the stopcock to collect the lower water layer first, followed by oil.
For more NCERT Solutions of Class 9 Science Exploration Chapter 5 Exploring Mixtures and their Separation Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-5/
See lessSolve the following problems: (i) A cake recipe uses dry ingredients, namely 75 g of sugar for 420 g of all-purpose flour and 5 g of sodium hydrogencarbonate. Express the concentration of each component in the mixture using an appropriate method. (ii) A brass alloy contains 70% copper by mass. Calculate the quantities of copper and zinc present in 120 g of brass.
(i) Total mass is 75 + 420 + 5 = 500 g. Sugar concentration is 75/500 × 100 = 15 percent, flour is 420/500 × 100 = 84 percent and sodium hydrogencarbonate is 5/500 × 100 = 1 percent. (ii) Copper = 70/100 × 120 = 84 g. Zinc = 120 − 84 = 36 g. For more NCERT Solutions of Class 9 Science ExploraRead more
(i) Total mass is 75 + 420 + 5 = 500 g. Sugar concentration is 75/500 × 100 = 15 percent, flour is 420/500 × 100 = 84 percent and sodium hydrogencarbonate is 5/500 × 100 = 1 percent. (ii) Copper = 70/100 × 120 = 84 g. Zinc = 120 − 84 = 36 g.
For more NCERT Solutions of Class 9 Science Exploration Chapter 5 Exploring Mixtures and their Separation Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-5/
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