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प्रश्न
Name a non-metal which is a good conductor of electricity.
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उत्तर
Graphite is a non-metal that is a good conductor of electricity.
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संबंधित प्रश्न
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
The elements which normally exist in the liquid state are :
Which of the two will scatter light : soap solution or sugar solution ? Why ?
Choose the correct answer.
A 15% alcohol solution means :
21.5 g of sodium chloride dissolves in 60 g of water at 25°C. Calculate the solubility of sodium chloride in water at that temperature.
Define solubility of a substance. How does it vary with temperature ?
One of the following liquids will leave behind a residue on heating. This one is :
One of the following represents the solution of solid in a solid. This one is :
Name the process which can be used to purify an impure sample of copper sulphate.
Naphthalene can be separated from sand :
Which one of the following scrap metal cannot be separated by magnetic separation ?
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
Name the metals that are used in jewellery.
The most reactive metal is ______.
______ is so hard that it can scratch glass.
Define the term matter.
