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प्रश्न
Name a metal which has no fixed shape.
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उत्तर
Mercury has no fixed shape.
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संबंधित प्रश्न
Define matter.
Differentiate between an atom and a molecule.
State two characteristics of matter demonstrated by Brownian motion.
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
Fill in the following blanks with suitable words :
Brass is an alloy which is considered a ..............
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
State two physical properties on the basis of which metals can be distinguished from non-metals.
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
What is the effect of temperature on the solubility of solids in liquids ?
Name the process by which common salt is obtained from sea-water.
How is the impurity of iron present in several substances removed in industries ?
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 ?
A solid mixture contains four constituents P, Q, R and S. P consists of tiny grains and it is mixed with
cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the
process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And
S is a white solid which is used in making ordinary dry cells.
- What could P, Q, R and S be ?
- How would you separate a mixture containing P, Q, R and S ?
The property which allows the metals to be hammered into their sheets is ______.
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
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 |
Define the term matter.
Define the term matter.
Define the term matter.
