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प्रश्न
Define matter. Give four examples of matter.
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उत्तर
Matter: Anything that occupies space and has mass is known as matter. The examples of matter are iron, wood, air and water.
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संबंधित प्रश्न
Gases have definite volume but no definite shape.
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
Name a metal which has a low melting point.
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.
Choose the correct answer.
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- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
Define solubility of a substance. How does it vary with temperature ?
What is meant by a solution?
Which of the following is not an emulsion ?
Milk of Magnesia is :
The solubility of ammonium chloride in water at various temperatures is given below :
| Temperature | : | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility | : | 24 g | 37 g | 41 g | 55 g | 66 g |
What mass of ammonium chloride would be needed to make a saturated solution of ammonium chloride in fifty grams of water at 40°C ?
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
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- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
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Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
Which statement is not correct for a mixture
Give an example of liquid in gas.
Define the term matter.
