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प्रश्न
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
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उत्तर
An element is made up of only one kind of atoms.
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संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Define matter.
The best evidence for the existence and movement of particles in liquids was provided by :
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
How would you confirm that a colourless liquid given to your is pure water ?
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
In what respects does a true solution differ from a colloidal solution ?
What is a colloid ? Give two examples of colloids (or colloidal solutions)
Fill in the following blanks with suitable words :
A heterogeneous mixture of liquid and solid is conveniently separated by...............
How will you separate a mixture containing sand and sugar ?
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :
(a) Which process will you use to separate a mixture of A and B ?
(b) Which method will you use to separate a mixture of B and C ?
(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
Justify your answer.
| Figure 1 | Figure 2 | Figure 3 |
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 |
 |
The arrangement of particles in three different phases of matter is shown above.
- Which state is represented by Fig. 1?
- In which state will the inter-particle attraction be maximum?
- Which one of them cannot be contained in an open vessel?
- Which one can take the shape of its container?
Name the metals that are used in jewellery.
Match the physical quantities given in column A to their S I units given in column B:
| (A) | (B) | ||
| (a) | Pressure | (i) | cubic metre |
| (b) | Temperature | (ii) | kilogram |
| (c) | Density | (iii) | pascal |
| (d) | Mass | (iv) | kelvin |
| (e) | Volume | (v) | kilogram per cubic metre |
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 |
The pressure of gases does not depend on the temperature of the gas and the volume it occupies.
Write scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
Define the term matter.
