Advertisements
Advertisements
प्रश्न
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
पर्याय
(i) and (iii)
(ii) and (iv)
(i) and (iv)
(iii) and (iv)
Advertisements
उत्तर
(i) and (iv)
Explanation:
Ice and air are homogeneous in nature since they have same composition throughout and there are no visible boundaries between the components.
APPEARS IN
संबंधित प्रश्न
A kind of matter which can sublime is
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
Name a metal which forms amalgams.
There is a large group of materials P which can be divided into three groups Q, R and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.
- What could the group of materials P be ?
- Name the substances Q. Give two examples of such substances.
- Name the substances R. Write two examples of such substances.
- Name the substances S. Give two examples of such substances.
- Out of Q, R and S, which substances are malleable and ductile ?
State whether colloidal solutions are homogeneous or heterogeneous.
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
What is the difference between solutions and colloids ?
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
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.
Describe a method to separate a mixture of common salt and sand.
Which of the following mixture cannot be separated by using water as the solvent ?
Which of the following cannot be separated from air by the process of fractional distillation ?
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
Explain the meaning of the term ‘matter’.
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
Complete the following table:
| S.No. | CELSIUS | KELVIN |
| 1. | 90°C | 363 K |
| 2. | ______ | 283 K |
| 3. | 63 °C | ______ |
| 4. | 250°C | ______ |
| 5. | ______ | 303 K |
The physical state of water at 373 K is ______.
Examples of foam are ______.
Define the term matter.
