Advertisements
Advertisements
Question
Naphthalene can be separated from sand :
Options
by sublimation
by distillation
by crystallisation
by using water as solvent
Advertisements
Solution
by sublimation
Naphthalene sublimes on heating, whereas sand does not. So, when the mixture is heated, solid naphthalene turns into vapours, which can be condensed. Sand remains in the container.
APPEARS IN
RELATED QUESTIONS
The molecules can move freely anywhere in
What are the conditions for 'something' to be called 'matter'?
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?
Name a metal which has no fixed shape.
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
Choose one term from the following which includes the other three :
aerosol, emulsion, colloid, sol
Define Foam Give one example.
Name the process which can be used to recover salt from an aqueous salt solution.
Fill in the following blanks with suitable words :
If a mixture contains iron filings as one of the constituents, it can be separated by using a .......................
Describe a method to separate a mixture of camphor and sand.
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
Explain how, impure copper sulphate can be purified by crystallisation.
The dyes present in fountain pen ink can be separated by the technique of :
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.
Explain the meaning of the term ‘matter’.
Match the physical quantities given in column A to their S I units given in column B:
| (A) | (B) | ||
| (a) | Pressure | (i) | cubic metre |
| (b) | Temperature | (ii) | kilogram |
| (c) | Density | (iii) | pascal |
| (d) | Mass | (iv) | kelvin |
| (e) | Volume | (v) | kilogram per cubic metre |
