Advertisements
Advertisements
Question
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Advertisements
Solution
The method for separating a mixture of iron filings and sulphur powder, employs the use of carbon disulphide as a solvent followed by filtration and evaporation.
Sulphur dissolves in carbon disulphide, whereas iron does not. So, the solution will contain undissolved iron in it. This can then be filtered using a filter paper, where iron remains as residue and is collected on the filter paper. The filtrate obtained contains sulphur dissolved in it. On evaporating the solvent of the filtrate, we obtain sulphur.
APPEARS IN
RELATED QUESTIONS
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
Fill in the blank :
The substances which can flow are called ________
A kind of matter which can sublime is
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
State two characteristics of matter demonstrated by Brownian motion.
State two physical properties on the basis of which metals can be distinguished from non-metals.
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
State whether the following statement is true or false :
Sponge is an example of solid sol.
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
Which of the following cannot be separated from air by the process of fractional distillation ?
Complete the given analogy.
Murukku from hot oil: ______:: Coffee powder residue from decoction: ______
The physical state of water at 373 K is ______.
______ is used for industrial refrigeration and transporting frozen food.
Define the term matter.
Define the term matter.
Define the term matter.
