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प्रश्न
Name one element, one compound and one mixture.
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उत्तर
Iron (Fe) is an element.
Water (H2O) is a compound.
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संबंधित प्रश्न
Fill in the blank :
The substances which can flow are called ________
Fill in the blank
Any matter which has a definite _______ but no definite shape is called a _______
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
A, B and C are all liquids. Liquid A has a comparatively low boiling point. On heating, liquid A vaporises completely without leaving behind any residue. Liquid A is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. Liquid B has a very high boiling point. It also vaporises completely on heating, without leaving any residue. Liquid B is a conductor of electricity and used in making thermometers. Liquid C has a moderate boiling point. On heating, liquid C vaporises leaving behind a white solid D which is used in cooking vegetables. The condensation of vapours from C give a liquid E which turns anhydrous CuSO4 to blue.
(a) Which liquid could be an element ? Name this element.
(b) Which liquid could be a mixture ? Name this mixture.
(c) Which liquid could be a compound ? Name this compound.
(d) What could the solid D be ?
(e) What do you think is liquid E ?
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
What will happen if a saturated solution is :
- heated
- cooled
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.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(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 ?
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
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 source from which nitrogen and oxygen are obtained on a large scale.
Name the process by which all the dye can be recovered from black ink.
Describe a method to separate a mixture of common salt and sand.
Name one pair of liquids which can be separated by using a separating funnel.
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
Which statement is not correct for a mixture
The physical state of water at 373 K is ______.
Compressibility of solids: ______.
Give an example of liquid in gas.
