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प्रश्न
Fill in the following blanks with suitable words :
The gases of air can be separated by fractional distillation of liquid air because they have different..............
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उत्तर
The gases of air can be separated by fractional distillation of liquid air because they have different boiling points.
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संबंधित प्रश्न
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Fill in the blank :
The substances which can flow are called ________
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Name a metal which forms amalgams.
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
What is the most common way of expressing the concentration of a solution ?
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
Name the process by which all the dye can be recovered from black ink.
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
Which one of the following scrap metal cannot be separated by magnetic separation ?
Name one pair of liquids which can be separated by using a separating funnel.
What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances ?
Which among the following is not a matter?
______ is so hard that it can scratch glass.
Which statement is not correct for a mixture
Solids do not flow.
The fluidity of solids: ______.
