Advertisements
Advertisements
प्रश्न
The three important metalloids are.............................. and ..........................
Advertisements
उत्तर
The three important metalloids are boron, silicon, and germanium.
APPEARS IN
संबंधित प्रश्न
Differentiate between an atom and a molecule.
Name two processes which provide the best evidence for the motion of particles in matter.
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
Name one element, one compound and one mixture.
Name two solid, two liquid and two gaseous elements at the room temperature.
Which of the following does not have a fixed melting point/boiling point ?
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
Which of the following is not an emulsion ?
Name the process which is used in milk dairies to separate cream from milk.
How will you separate iron pins from sand ?
The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.
(a) What do you think could (i) constituent A, and (ii) liquid D be ?
(b) What could (i) constituent B, and (ii) liquid E be ?
(c) What could liquid C be ?
(d) How will you separate the mixture containing A, B and C ?
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
Wipe the board with a duster and then tap the duster against the table. What do you see?
Define the term matter.
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
The physical state of water at 373 K is ______.
Evaporation does form bubbles.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
