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प्रश्न
State any two properties for believing that aluminium is a metal.
उत्तर
Aluminium is lustrous and malleable, so it is a metal.
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संबंधित प्रश्न
Intermolecular space is maximum in .......... less in ............ and the least in .........
Give one difference between atoms and molecules.
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
Name the property which allows metals to be hammered into thin sheets.
Give reason why copper metal is used for making electric wires.
How would you confirm that a colourless liquid given to your is pure water ?
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
On the basis of composition of matter, milk is considered to be :
Explain what happens when a beam of light is passed through a colloidal solution.
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 ?
How will you separate camphor, common salt and iron nails from their mixture ?
Which of the following cannot be separated from air by the process of fractional distillation ?
The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.
(a) What do you think could (i) constituent A, and (ii) liquid D be ?
(b) What could (i) constituent B, and (ii) liquid E be ?
(c) What could liquid C be ?
(d) How will you separate the mixture containing A, B and C ?
Define the term matter.
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
Atoms or groups of atoms having a charge are called ______.
The physical state of water at 373 K is ______.
The fluidity of solids: ______.
Define the term matter.
