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प्रश्न
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
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उत्तर
Asmita identified the earthen pot by its shape.
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संबंधित प्रश्न
Give reason why copper metal is used for making electric wires.
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
One of the following is a solid foam. This one is :
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
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(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
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 ?
Fill in the following blanks with suitable words :
Immiscible liquids are separated by using a .....................
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
Explain how, nitrogen , oxygen and argon gases are separated from air.
The particles in the matter are extremely small and can be seen even with a powerful microscope.
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
