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
विकल्प
(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
Intermolecular force of attraction is maximum in ............ less in .......... and the least in .............
Name the terms for the change of a solid into liquid.
What is the scientific name of particles which make up mater?
Give reason why graphite is used for making elecrode in a dry cell.
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
Which one of the following is not a metalloid ?
State whether colloidal solutions are homogeneous or heterogeneous.
Choose the correct answer.
A 5 per cent sugar solution means that :
What is the difference between solutions and colloids ?
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
Define Foam Give one example.
Name the process by which all the dye can be recovered from black ink.
Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
Which of the following mixture cannot be separated by using water as the solvent ?
A solid mixture contains four constituents P, Q, R and S. P consists of tiny grains and it is mixed with
cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the
process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And
S is a white solid which is used in making ordinary dry cells.
- What could P, Q, R and S be ?
- How would you separate a mixture containing P, Q, R and S ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
Which among the following ______ will get attracted to by magnet?
Rusting of an article made up of iron is called
Which statement is not correct for a mixture
