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प्रश्न
State whether the following statement is true or false :
Sponge is an example of solid sol.
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उत्तर
False. Sponge is an example of solid foam.
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संबंधित प्रश्न
What do you mean by the inter-molecular spaces? How do they vary in different states of matter?
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Name a non-metal which is a good conductor of electricity.
Which type of elements, metals or non-metals, show the property of brittleness ?
Name one element, one compound and one mixture.
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
Name a metal which forms amalgams.
The element which is not common between the compounds called baking soda and soda ash is
Define Sol and give one example.
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
Fill in the following blanks with suitable words :
A heterogeneous mixture of liquid and solid is conveniently separated by...............
How will you separate camphor, common salt and iron nails from their mixture ?
One of the following does not undergo sublimation. This one is :
______ is not made of matter.
Which among the following is not a matter?
Atoms or groups of atoms having a charge are called ______.
Complete the following table:
| S.No. | CELSIUS | KELVIN |
| 1. | 90°C | 363 K |
| 2. | ______ | 283 K |
| 3. | 63 °C | ______ |
| 4. | 250°C | ______ |
| 5. | ______ | 303 K |
Examples of foam are ______.
Define the term matter.
