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प्रश्न
Name the process by which all the dye can be recovered from black ink.
उत्तर
The process of evaporation can be used to recover all the dye from black ink.
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संबंधित प्रश्न
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
Define matter. Give four examples of matter.
State two physical properties on the basis of which metals can be distinguished from non-metals.
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
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
Which of the following is a sol ?
Shaving cream, Milk, Fog, Soap solution, Hairspray
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
Which of the following can be called a suspension ?
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
How would you separate iodine from a mixture of iodine and common salt ?
With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.
Which of the following mixture cannot be separated by using water as the solvent ?
Naphthalene can be separated from sand :
The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :
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.
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 |
Liquids cannot be compressed and they have fixed volume.
Define the term matter.
