Advertisements
Advertisements
प्रश्न
What difference in the properties of oil and water enable their separation by a separating funnel ?
उत्तर
The differences in the properties of oil and water that enable their separation by separating funnel are:
- Oil and water are immiscible liquids.
- Oil and water have different densities.
APPEARS IN
संबंधित प्रश्न
What is the scientific name of particles which make up mater?
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
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 ?
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
Explain what happens when a beam of light is passed through a colloidal solution.
Name the different types of solutions. Give one example of each.
Define solubility of a substance. How does it vary with temperature ?
What is a colloid ? Give two examples of colloids (or colloidal solutions)
Which of the following represents the solubility of sugar in water at 20°C ?
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
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 ?
Explain the meaning of the term ‘matter’.
Which among the following ______ will get attracted to by magnet?
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 |
Evaporation does form bubbles.
Gas-solid is ______.
Define the term matter.