Advertisements
Advertisements
प्रश्न
Describe a method to separate a mixture of common salt and sand.
Advertisements
उत्तर
Separation of common salt and sand from a mixture involves the processes of filtration, followed by evaporation.
Sand can be separated from a mixture of sand and salt solution (salt dissolved in water) by filtration. After filtration, sand remains on the filter paper as a residue. Common salt can now be obtained from the filtrate by boiling it. Boiling causes all the water to evaporate and salt is left behind. This process is called evaporation.
APPEARS IN
संबंधित प्रश्न
Name the processes involved in two cases.
Fill in the blank
Liquids have a definite ______
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
The property/properties which enable copper metal to be used for making electric wires is/are :
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
How will you differentiate between a suspension and a colloid ?
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.
Name the process by which common salt is obtained from sea-water.
How will you separate a mixture of iron filings and powdered carbon ?
How will you separate water from mustard oil ?
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
______ is a smallest particle.
The most reactive metal is ______.
Evaporation is always accompanied by ______ in temperature.
Define the term matter.
