Advertisements
Advertisements
प्रश्न
Pure copper sulphate can be obtained from an impure sample by the process of :
पर्याय
evaporation
fractional distillation
centrifugation
crystallisation
उत्तर
crystallization
Crystallization is the process of cooling a hot concentrated solution of a substance to obtain its crystals in pure form.
APPEARS IN
संबंधित प्रश्न
The inter-molecular force is maximum in
Which one is a kind of matter:
Explain why air is used to inflate tyres.
When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of :
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
What elements do the following compounds contain ?
Sugar, Common salt
The element which is not common between the compounds called baking soda and soda ash is
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
What is the difference between solutions and colloids ?
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
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.
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
Define solubility of a substance. How does it vary with temperature ?
What is a colloid ? Give two examples of colloids (or colloidal solutions)
How will you separate iron pins from sand ?
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
Evaporation does form bubbles.
Define the term matter.