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प्रश्न
Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
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उत्तर
A mixture of kerosene and petrol can be separated by fractional distillation.
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संबंधित प्रश्न
Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?
Name a metal which is soft and a non-metal which is hard.
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
How would you confirm that a colourless liquid given to your is pure water ?
State one property in which a solution of sugar in water resembles a mixture of sugar and sand, and one property in which it differs from it.
You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?
Name a metal which has no fixed shape.
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.
What is the difference between solutions and colloids ?
One of the following liquids will leave behind a residue on heating. This one is :
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
Name the process by which the various gases of the air are separated.
Name the process by which common salt is obtained from sea-water.
Fill in the following blanks with suitable words :
Immiscible liquids are separated by using a .....................
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
What's the solution?
We need to make a sherbet quickly for some guests. But we only have sugar candy in the house.
Justify your answer.
| Figure 1 | Figure 2 | Figure 3 |
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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?
Name the metals that are used in jewellery.
A teabag placed in a cup of hot water will diffuse into the water.
