Advertisements
Advertisements
Question
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
Advertisements
Solution
Crystallization is a better than evaporation for recovering sugar from sugar solution. During evaporation, sugar can get charred on heating. However, in crystallization, no such problem occurs and we can get pure crystals of sugar.
APPEARS IN
RELATED QUESTIONS
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
Explain why steel is used to make railway lines.
An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
Name a non-metal which is a good conductor of electricity.
What is the other name for impure substances ? Give two examples of impure substances.
State any two properties for believing that aluminium is a metal.
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
On the basis of composition of matter, milk is considered to be :
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.
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
Choose one term from the following which includes the other three :
aerosol, emulsion, colloid, sol
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
Name the process which is used in milk dairies to separate cream from milk.
Which among the following is not a matter?
Rusting of an article made up of iron is called
In Aerosol the dispersed phase is liquid and the dispersion medium is gas.
Solid is an arrangement of particles ______.
Give an example of liquid in gas.
