Advertisements
Advertisements
प्रश्न
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
पर्याय
(i) and (ii)
(i) and (iii)
(iii) and (iv)
(ii) and (iii)
Advertisements
उत्तर
(i) and (iii)
A pure substance is made up of only one kind of particles like elements. The composition of pure compounds is also same throughout.
APPEARS IN
संबंधित प्रश्न
What are the characteristics of matter?
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
Name a non-metal which is a good conductor of electricity.
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
Name a metal which can be easily cut with a knife.
Name a metal which has no fixed shape.
The property/properties which enable copper metal to be used for making electric wires is/are :
State whether the following statement is true or false :
Bread is an example of solid foam.
How will you test whether a given solution is a colloidal solution ?
Define the emulsion. Give one example.
What is the general name of the process by which tea-leaves are separated from prepared tea ?
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
How would you separate iodine from a mixture of iodine and common salt ?
Which one of the following scrap metal cannot be separated by magnetic separation ?
Which among the following is not a matter?
Solids possess very high kinetic energy.
The phenomenon of Evaporation takes place at the ______ of a liquid.
Examples of foam are ______.
