Advertisements
Advertisements
Question
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Advertisements
Solution
All the elements can be divided into following three groups:
- Metals: Examples: Aluminium and copper
- Non-metals: Examples: Potassium and calcium
- Metalloids: Examples: Arsenic and antimony
APPEARS IN
RELATED QUESTIONS
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
What is meant by saying that non-metals are brittle ?
Out of a colloid, solution and a suspension :
which one has the largest particles ?
Which of the following is a sol ?
Shaving cream, Milk, Fog, Soap solution, Hairspray
Define the emulsion. Give one example.
Define solubility of a substance. How does it vary with temperature ?
How would you prepare a saturated solution of sodium chloride in water at 25°C ? What will happen if this solution is cooled to 10°C ?
One of the following liquids will leave behind a residue on heating. This one is :
What type of magnet is fitted on a crane to separate scrap iron objects from a heap of waste materials in factories ?
How will you separate water from mustard oil ?
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.
What's the solution?
We need to make a sherbet quickly for some guests. But we only have sugar candy in the house.
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
Wipe the board with a duster and then tap the duster against the table. What do you see?
Stars including Sun are covered in ______.
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
Compressibility of solids: ______.
Give an example of liquid in gas.
