Advertisements
Advertisements
प्रश्न
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
Advertisements
उत्तर
The property that enables the separation of two miscible liquids by fractional distillation is the difference in their boiling points.
APPEARS IN
संबंधित प्रश्न
What is the scientific name of particles which make up mater?
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
The element which is not common between the compounds called baking soda and soda ash is
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 contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
How is the impurity of iron present in several substances removed in industries ?
Explain how, impure copper sulphate can be purified by crystallisation.
What is chromatography ? State its two applications.
The material which is added to water during purification process at the water works so as to disinfect it is :
The boiling point of liquid argon 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.
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
The fluidity of solids: ______.
Give an example of a molecule.
Define the term matter.
