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In text questions page number 18
1. Differentiate between homogeneous and heterogeneous mixtures with examples.
Answer:
| Homogeneous Mixtures | Heterogeneous Mixtures |
| 1. Homogeneous mixtures have uniform composition. | 1. Heterogeneous mixtures have non uniform composition |
| 2. It has no visible boundaries of separation between its constituents. | 2. It has visible boundaries of separation between its constituents. |
| 3. Some examples of homogeneous mixtures are: salt in water, sugar in water. | 3. Some examples of heterogeneous mixtures are: water and sand, oil and water. |
2. How are sol, solution and suspension different from each other?
Answer:
| Sol(Colloidal solution) | Solution | Suspension |
| 1.They are heterogeneous in nature | 1.They are homogeneous in nature | 1.They are heterogeneous in nature |
| 2. They scatter a beam of light and hence show Tyndall effect. | 2. They do not scatter a beam of light and hence do not show Tyndall effect. | 2. They do not scatter a beam of light and hence do not show Tyndall effect. |
| 3. They are quite stable | 3. They are very stable | 3. They are unstable |
| 4. Examples of sol are: milk, blood smoke etc. | 4. Examples of solution are: salt in water, sugar in water. | 4. Examples of suspension are: sand in water, dusty air |
3. To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
Answer:
Mass of solute (sodium chloride) =36g
Mass of solvent (water) =100g
Mass of solution = Mass of Solute + Mass of solvent
= 36g +100g = 136g
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