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प्रश्न
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
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उत्तर
Among the given options, air is a mixture as it is composed of different gases.
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संबंधित प्रश्न
Which type of elements, metals or non-metals, show the property of brittleness ?
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
State any two properties for believing that aluminium is a metal.
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
Which of the following is not an element ?
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
What do you understand by the statement " the solubility of copper sulphate in water at 20°C is 20.7 g" ?
What is the difference between colloids and suspensions ?
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 :
The separation of liquids by fractional distillation is based on the difference in their .....................
How will you separate camphor, common salt and iron nails from their mixture ?
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :
(a) Which process will you use to separate a mixture of A and B ?
(b) Which method will you use to separate a mixture of B and C ?
(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- 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 ?
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 ?
Wipe the board with a duster and then tap the duster against the table. What do you see?
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
| (A) | (B) | ||
| (a) | degree celsius | (i) | kilogram |
| (b) | centimetre | (ii) | pascal |
| (c) | gram per centimetre cube | (iii) | metre |
| (d) | bar | (iv) | kelvin |
| (e) | milligram | (v) | kilogram per metre cube |
Solid is an arrangement of particles ______.
