Advertisements
Advertisements
प्रश्न
Give reason why copper metal is used for making electric wires.
Advertisements
उत्तर
Copper is a good conductor of electricity. It is ductile and less expensive; therefore, it is used for making electrical wires.
APPEARS IN
संबंधित प्रश्न
The inter-molecular force is maximum in
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
Name two solid, two liquid and two gaseous elements at the room temperature.
Name a metal which is yellow in colour.
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
Define solvent.
What will happen if a saturated solution is :
- heated
- cooled
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 is a solid foam. This one is :
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
Name the process you would use to separate a mixture of water and alcohol.
Describe a method to separate a mixture of camphor and sand.
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
Select the correct answer from A, B, C, D & E for the statement given below:
An atom or group of atoms _________ having a resultant charge.
______ is not made of matter.
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
Atoms are tiny particles that repel each other when they are squeezed very close.
A teabag placed in a cup of hot water will diffuse into the water.
