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प्रश्न
The best evidence for the existence and movement of particles in liquids was provided by :
पर्याय
John Dalton
Ernest Rutherford
J.J. Thomson
Robert Brown
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उत्तर
Robert Brown
APPEARS IN
संबंधित प्रश्न
Liquids have definite volume but do not have definite shape.
Define the following term of Matter .
Name one solid, one liquid and one gaseous non-metal.
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
What are the two types of pure substances? Give one example of each type.
Name two solid, two liquid and two gaseous elements at the room temperature.
Which one of the following is not a metalloid ?
How will you test whether a given solution is a colloidal solution ?
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.
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..............
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
The dyes present in fountain pen ink can be separated by the technique of :
The correct increasing order of the boiling points of liquid oxygen, liquid argon and liquid nitrogen present in liquid air is :
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 ?
______ is not made of matter.
Atoms or groups of atoms having a charge are called ______.
The movement of particles in liquids is ______.
Gases do not diffuse very easily.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
