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प्रश्न
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
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उत्तर
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.
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संबंधित प्रश्न
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
Define matter. Give four examples of matter.
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
The three important metalloids are.............................. and ..........................
What elements do the following compounds contain ?
Sugar, Common salt
What is the other name for impure substances ? Give two examples of impure substances.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
State two physical properties on the basis of which metals can be distinguished from non-metals.
What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
Draw a flow-chart for the schematic representation of different types of matter.
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
What is a colloid ? Give two examples of colloids (or colloidal solutions)
One of the following is a solid foam. This one is :
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Explain how, impure copper sulphate can be purified by crystallisation.
What is chromatography ? State its two applications.
Justify your answer.
| Figure 1 | Figure 2 | Figure 3 |
 |
 |
 |
The arrangement of particles in three different phases of matter is shown above.
- Which state is represented by Fig. 1?
- In which state will the inter-particle attraction be maximum?
- Which one of them cannot be contained in an open vessel?
- Which one can take the shape of its container?
Liquids have ______.
Define the term matter.
