Advertisements
Advertisements
प्रश्न
The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.
(a) What do you think could (i) constituent A, and (ii) liquid D be ?
(b) What could (i) constituent B, and (ii) liquid E be ?
(c) What could liquid C be ?
(d) How will you separate the mixture containing A, B and C ?
Advertisements
उत्तर
- i. Constituent A is yellow coloured solid element. It could be sulphur.
ii. Sulphur dissolves in liquid D. So, liquid D could be carbon disulphide.
i. Constituent B is a blue coloured salt, which is insoluble in carbon disulphide but dissolves in water. So, it could be copper sulphate.
ii. Liquid E could be water as it dissolves copper sulphate.- Liquid C could be vegetable oil as it turns into a solid fat on hydrogenation.
- We will separate the mixture containing A, B, and C by following process: At first, we filter the mixture of A, B, and C.
Vegetable oil C, being liquid, will be obtained as a filtrate.
Residue consists of A (sulphur) and B (copper sulphate).
We add water to the residue and shake it before filtering. A (sulphur) is obtained as residue.
Now, we evaporate filtrate to obtain B (copper sulphate).
APPEARS IN
संबंधित प्रश्न
Define the term matter. What is it composed of?
Which type of elements, metals or non-metals, show the property of brittleness ?
What are pure substances ? Give two examples of pure substances.
What is the other name for impure substances ? Give two examples of impure substances.
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
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.
What are the three general classes of matter ? Give one example of each type.
Which one of the following is not a metalloid ?
The property/properties which enable copper metal to be used for making electric wires is/are :
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 ?
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
Define Aerosol Give one example.
The dyes present in fountain pen ink can be separated by the technique of :
The technique which is used to separate particles of a solid suspended in a liquid quickly is called :
You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?
The most reactive metal is ______.
Liquids have ______.
A teabag placed in a cup of hot water will diffuse into the water.
Higher the temperature, the higher the kinetic energy of particles.
