Three mixtures A, B and C are obtained by stirring three different solids in water taken in separate beakers. When mixture A is allowed to stand for some time, then its particles settle at the bottom of the beaker. When a beam of light is passed through mixture A in a dark room, the path of light becomes visible when observed from the side of the beaker. When mixture B is allowed to stand for a considerable time, even then its particles do not settle down. Mixture B, however, scatters the beam of light just like mixture A. The particles of mixture C do not settle down on keeping and it also does not scatter a beam of light passing through it.(a) What are the mixtures like A known as?(b) What are the mixtures like B known as?(c) What are the mixtures like C known as?(d) Name the phenomenon exhibited by A and B which occurs on passing a beam of light through them.(e) Name one mixture each of which is like (i) A (ii) B, and (iii) C.
(a) Mixtures like A are known as suspensions.
(b) Mixtures like B are known as colloids.
(c) Mixtures like C are known as true solutions.
(d) The phenomenon exhibited by A and B, which occur on passing a beam of light through them, is called the Tyndall effect.
(e) (i) Mud water mixture is like A.
(ii) Soap solution is a mixture like B.
(iii) Sugar solution is a mixture like C.
Related Articles
- When a beam of sunlight enters a room through a window, we can see tiny particles X suspended in a gas (or rather a mixture of gases) Y which are moving rapidly in a very haphazard manner.(a) What could particles X be?(b) Name the gas (or mixture of gases) Y.(c) What is the phenomenon exhibited by particles X known as?(d) What is causing the movement of particles X?(e) What conclusion does the existence of this phenomenon give us about the nature of matter?
- (a) What is a mixture? Give two example of mixtures.(b) What is meant by (i) homogeneous mixtures, and (ii) heterogeneous mixtures?Give two examples of homogeneous mixtures and two of heterogeneous mixtures.(c) What is the other name of homogeneous mixtures?
- A small bulb is placed at the focal point of a converging lens. When the bulb is switched on, the lens produces:(a) a convergent beam of light (b) a pergent beam of light(c) a parallel beam of light (d) a patch of coloured light
- (a) With the help of a labeled ray diagram show the path followed by a narrow beam of monochromatic light when it passes through a glass prism.(b) What would happen if this beam is replaced by a narrow beam of white light?
- Explain what happens when a beam of light is passed through a colloidal solution.
- A beam of white light falls on a glass prism. The colour of light which undergoes the least bending on passing through the glass prism is:(a) violet (b) red (c) green (d) blue
- (a) What is a mixture? Give two examples of mixtures.​(b) What is meant by (i) homogenous mixtures, and (ii) heterogeneous mixtures? Give two examples of homogeneous mixtures and two of heterogeneous mixtures.
- There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when liquids B and C are mixed, they form two separate layers :(a) Which process will you use to separate a mixture of A and B?(b) Which method will you use to separate a mixture of B and C?(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
- Which of the following is not a mixture?(a) kerosene (b) air(c) alcohol (d) petrol
- (a) State the main points of difference between homogeneous and heterogeneous mixtures.(b) Classify the following materials as homogeneous mixtures and heterogeneous mixtures :Soda-water, Wood, Air, Soil, Vinegar, Alcohol and water mixture, Petrol and water mixture, Chalk and water mixture, Sugar and water mixture, Copper sulphate solution.
- Name the process associated with the following(a) Dry ice is kept at room temperature and at one atmospheric pressure.(b) A drop of ink placed on the surface of water contained in a glass spreads throughout the water.(c) A potassium permanganate crystal is in a beaker and water is poured into the beaker with stirring.(d) An acetone bottle is left open and the bottle becomes empty.(e) Milk is churned to separate cream from it.(f) Settling of sand when a mixture of sand and water is left undisturbed for some time.(g) Fine beam of light entering through a small hole in a dark room, illuminates the particles in its paths.
- There are three plants A, B and C. The flowers of plant A open their petals in bright light during the day but close them when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but close them during the day when there is bright light. The leaves of plant C fold up and droop when touched with fingers or any other solid object.(a) Name the phenomenon shown by the flowers of (i) plant A, and (ii) plant B.(b) Name one flower each which behaves like the flower of (i) plant A, and (ii) plant B.(c) Name the phenomenon exhibited by the leaves of plant C.(d) Name a plant whose leaves behave like those of plant C.(e) Which plant/plants exhibit the phenomenon based on growth movements?
- Which one of the following is most likely to exhibit Tyndall effect ?(a) sugar and water mixture(b) potash alum and water mixture(c) chalk powder and water mixture(d) potassium permanganate and water mixture
- When an insect sits on the flower of a plant then some particles A present in the top of little stalks in the flower attach to its body hair. When this insect now sits on the flower of another similar plant, then particles A attached to the hair of insect are put on the top of a flask-shaped organ at the centre of flower. The particle A grows a long tube B from the top of flask-shaped organ through which C moves down and reaches the bottom part of flask-shaped organ. Here C fuses with the nucleus of D contained in structure E. The fusion of C and D forms new cell F which grows and develops into a seed of the plant.(a)What are particles A? What is the process of transferring A from one flower to another flower of similar plant by the insect known as? (b)What is the name of tube B? (c)What is C which moves down through the tube B? (d)Name D and E. (e)What is F?
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies