Advertisements
Advertisements
Question
Write a method to separate a mixture of sand and potash alum.
Advertisements
Solution
A mixture of sand and potash alum is separated by filtration followed by evaporation. The mixture contains two constituents, i.e., potash alum and sand.
Mix both the constituents thoroughly with water so that potash alum gets dissolved in water. However, sand, being insoluble in water, will not get dissolved in it. On filtering the liquid, the solid that is left behind will be the sand, and the liquid will be a solution of potash alum. Potash alum can now be re-crystallized by heating the solution gently. In the process, all the water gets evaporated leaving behind potash alum.
APPEARS IN
RELATED QUESTIONS
Name the property which enables metals to be drawn into wires.
Which type of elements, metals or non-metals, show the property of brittleness ?
What are the two types of pure substances? Give one example of each type.
Give reason why copper metal is used for making electric wires.
Name a metal which forms amalgams.
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
“Is malleable and ductile” best describes :
Which one of the following is not a metalloid ?
A, B and C are all liquids. Liquid A has a comparatively low boiling point. On heating, liquid A vaporises completely without leaving behind any residue. Liquid A is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. Liquid B has a very high boiling point. It also vaporises completely on heating, without leaving any residue. Liquid B is a conductor of electricity and used in making thermometers. Liquid C has a moderate boiling point. On heating, liquid C vaporises leaving behind a white solid D which is used in cooking vegetables. The condensation of vapours from C give a liquid E which turns anhydrous CuSO4 to blue.
(a) Which liquid could be an element ? Name this element.
(b) Which liquid could be a mixture ? Name this mixture.
(c) Which liquid could be a compound ? Name this compound.
(d) What could the solid D be ?
(e) What do you think is liquid E ?
A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the concentration of this solution.
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
Choose one term from the following which includes the other three :
aerosol, emulsion, colloid, sol
Milk of Magnesia is :
How is scrap iron separated from a heap of waste materials in factories?
How will you separate a mixture of iron filings, chalk powder and common salt ?
How is cream separated from milk ?
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
Asmita went to buy an earthen pot. There she saw many things kept for sale.
What is the difference between a substance and an object?
Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water.
Examples of foam are ______.
