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प्रश्न
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
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उत्तर
Milk is a colloidal solution but vinegar is a true solution.
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संबंधित प्रश्न
The inter-molecular force is maximum in
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
What is the scientific name of particles which make up mater?
Define matter. Give four examples of matter.
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
What are the three general classes of matter ? Give one example of each type.
There is a large group of materials P which can be divided into three groups Q, R and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.
- What could the group of materials P be ?
- Name the substances Q. Give two examples of such substances.
- Name the substances R. Write two examples of such substances.
- Name the substances S. Give two examples of such substances.
- Out of Q, R and S, which substances are malleable and ductile ?
Out of a colloid, solution and a suspension :
which one has the largest particles ?
How will you test whether a given solution is a colloidal solution ?
Milk of Magnesia is :
What is the general name of the process by which tea-leaves are separated from prepared tea ?
Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
How would you separate iodine from a mixture of iodine and common salt ?
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.
Which of the following cannot be separated from air by the process of fractional distillation ?
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 |
