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प्रश्न
Name a metal which has no fixed shape.
उत्तर
Mercury has no fixed shape.
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संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
Differentiate between an atom and a molecule.
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Define solute.
In what respects does a true solution differ from a colloidal solution ?
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
One of the following represents the solution of solid in a solid. This one is :
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
Name the process which can be used to recover salt from an aqueous salt solution.
Write a method to separate a mixture of sand and potash alum.
How is the impurity of iron present in several substances removed in industries ?
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
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 ?
______ is not made of matter.
______ is a smallest particle.
The movement of particles in liquids is ______.
Write scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
