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प्रश्न
The best way to recover sugar from an aqueous sugar solution is :
विकल्प
evaporation to dryness
distillation
filtration
crystallisation
उत्तर
crystallisation
Crystallisation is a better technique to recover sugar from sugar solution because sugar decomposes or gets charred on heating. Also, the soluble impurities get removed by crystallisation.
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संबंधित प्रश्न
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
Liquids have definite shape and definite volume.
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Explain why steel is used to make railway lines.
Define matter. Give four examples of matter.
How would you confirm that a colourless liquid given to your is pure water ?
The elements which normally exist in the liquid state are :
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
What is the most common way of expressing the concentration of a solution ?
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
What is a suspension ? Give two examples of suspensions.
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Name the process by which common salt is purified.
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
Which one of the following scrap metal cannot be separated by magnetic separation ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
Solids do not flow.
The fluidity of solids: ______.
