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प्रश्न
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
उत्तर
The separation of liquids by fractional distillation is based on the difference in their 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
Define matter. Give four examples of matter.
The best evidence for the existence and movement of particles in liquids was provided by :
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
“Is malleable and ductile” best describes :
What is the most common way of expressing the concentration of a solution ?
State whether the following statement is true or false :
Bread is an example of solid foam.
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.
Define solubility of a substance. How does it vary with temperature ?
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
Name the process by which common salt is purified.
Fill in the following blanks with suitable words :
Immiscible liquids are separated by using a .....................
How will you separate a mixture of iron filings, chalk powder and common salt ?
Which one of the following scrap metal cannot be separated by magnetic separation ?
There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :
(a) Which process will you use to separate a mixture of A and B ?
(b) Which method will you use to separate a mixture of B and C ?
(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
Asmita went to buy an earthen pot. There she saw many things kept for sale.
What is the difference between a substance and an object?
Higher the temperature, the higher the kinetic energy of particles.
