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प्रश्न
Honey is more viscous than water. Can you suggest why?
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उत्तर
Honey is more viscous than water because inter-molecular force of attraction between honey particles is more than that of water molecules.
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संबंधित प्रश्न
Solids have definite shape and definite volume.
Differentiate between an atom and a molecule.
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
Describe in your own words, what happens to the particles when salt dissolves in water.
What is the other name for impure substances ? Give two examples of impure substances.
Give reason why graphite is used for making elecrode in a dry cell.
The property/properties which enable copper metal to be used for making electric wires is/are :
Which of the following does not have a fixed melting point/boiling point ?
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
Explain what happens when a beam of light is passed through a colloidal solution.
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.
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Which technique is used in a washing machine to squeeze out water from wet clothes while drying ?
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Define the term matter.
