Advertisements
Advertisements
प्रश्न
One of the following is a solid foam. This one is :
पर्याय
butter
bread
shaving cream
ruby
Advertisements
उत्तर
bread
Solid foam is a colloid in which a gas is dispersed in a solid medium. Bread is an example of solid foam.
APPEARS IN
संबंधित प्रश्न
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
Name one solid, one liquid and one gaseous non-metal.
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
Give reason why copper metal is used for making electric wires.
On the basis of composition of matter, milk is considered to be :
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
Classify the following into solutions, suspensions and colloids :
Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.
Define the emulsion. Give one example.
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.
The solubility of ammonium chloride in water at various temperatures is given below :
| Temperature | : | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility | : | 24 g | 37 g | 41 g | 55 g | 66 g |
What mass of ammonium chloride would be needed to make a saturated solution of ammonium chloride in fifty grams of water at 40°C ?
Name the source from which nitrogen and oxygen are obtained on a large scale.
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
Name the process which can be used to recover salt from an aqueous salt solution.
Name the process which is used in milk dairies to separate cream from milk.
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
Atoms are tiny particles that repel each other when they are squeezed very close.
Higher the temperature, the higher the kinetic energy of particles.
