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प्रश्न
Name two solid, two liquid and two gaseous elements at the room temperature.
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उत्तर
Aluminium and copper are two elements that are solid at room temperature. Both bromine and mercury are liquid at room temperature. Nitrogen and hydrogen are two elements that are gaseous at room temperature.
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संबंधित प्रश्न
Name the terms for the particles of matter which may or may not have independent existence.
What are the conditions for 'something' to be called 'matter'?
What is meant by saying that metals are malleable and ductile ?
Give reason why copper metal is used for making electric wires.
You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?
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
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the concentration of this solution.
Define solvent.
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
What is a colloid ? Give two examples of colloids (or colloidal solutions)
Name the process by which all the dye can be recovered from black ink.
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
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?
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
The movement of particles in liquids is ______.
Higher the temperature, the higher the kinetic energy of particles.
Give an example of liquid in gas.
Define the term matter.
