Advertisements
Advertisements
प्रश्न
Give reason why graphite is used for making elecrode in a dry cell.
उत्तर
Graphite is a non-corrosive non-metal and a poor conductor of electricity. It is also cheap and insoluble in water, acids and bases. It is inert (does not react) to the electrolytes present in the dry cells. Thus, it makes a good material for an electrode.
APPEARS IN
संबंधित प्रश्न
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Define matter. Give four examples of matter.
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
Which type of elements, metals or non-metals, show the property of brittleness ?
State one property in which a solution of sugar in water resembles a mixture of sugar and sand, and one property in which it differs from it.
Which of the following is not an element ?
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
Out of a colloid, solution and a suspension :
which one has the largest particles ?
What happens when the temperature of a saturated sugar solution is increased ?
Define solvent.
One of the following does not show Tyndall effect. This one is :
What is the difference between colloids and suspensions ?
Name the process by which the various gases of the air are separated.
How will you separate a mixture containing sand and sugar ?
How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water ?
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
Solids possess very high kinetic energy.
Evaporation does form bubbles.
