A glass of cold milk sometimes forms a coat of water on the outside of the glass (Often referred to as 'sweat'). How does most of the water get there?
Important Questions on Matter and its States
Consider the following statements and choose the correct option:
1. No change in volume occurs on dissolving sugar in water.
2. Sugar particles go into the empty spaces present in the particles of water.
Some suspensions are given:
1.Fog
2. Air
3. Blood
4. Paint
5. Aerosol spray
Among the following, true suspensions are:
Match Column I with Column II and select the correct answer using the codes given below:
| Column I | Column II | ||
| A. | Smoke | 1. | Dispersion of gas in liquid |
| B. | Gel | 2. | Dispersion of solid in solid |
| C. | Emulsion | 3. | Dispersion of liquid in liquid |
| D. | Foam | 4. | Dispersion of liquid in solid |
| 5. | Dispersion of solid in gas |
Codes:
A B C D
Consider the following table:
| Dispersed Phase | Dispersion Medium | Types of Colloid |
| Solid | A | Solid Solution |
| B | Liquid | Emulsion |
| Gas | C | Foam |
A, B and C in the given table are:
Which of the following is/are true when milk changes into curd?
1. It changes color.
2. The change cannot be reversed.
3. It changes the taste.
4. Its state is changed from liquid to semi-solid.
Choose the correct option from below:
Identify the correct statements.
1. The freezing of water into ice is a chemical change.
2. The changes occur inside the molecular composition is a chemical change.
3. A new substance is obtained in a chemical change.
4. The change in shape, size and state is a chemical change.
Select the correct answer from the given below code.
Consider the following statements and choose the correct option:
Statement I: Conversion of blue copper sulphate to black cupric oxide on heating is a physical change.
Statement II : A change in which chemical composition does not change is called physical change.
