Advertisements
Advertisements
प्रश्न
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
Advertisements
उत्तर
The separation of liquids by fractional distillation is based on the difference in their boiling points.
APPEARS IN
संबंधित प्रश्न
Define matter.
What are the two conditions for the interconversion of states of matter ?
Define the following term of Atom .
Which one is a kind of matter:
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
What is the difference between solutions and colloids ?
Explain what happens when a beam of light is passed through a colloidal solution.
How will you differentiate between a suspension and a colloid ?
Tincture of iodine has antiseptic properties. This solution is made by dissolving :
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.
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.
You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture ?
Explain the meaning of the term ‘matter’.
What's the solution?
We need to make a sherbet quickly for some guests. But we only have sugar candy in the house.
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
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?
Solids possess very high kinetic energy.
Write a scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
