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प्रश्न
How does graphite act as a lubricant?
उत्तर
Graphite has a hexagonal structure and weak van der Waals force between the layers of the carbon atoms in its crystal. Due to this weak force, the layers of carbon atoms in graphite can slide over one another, making graphite slippery in nature and capable of acting as a lubricant.
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संबंधित प्रश्न
Name the type of bonds formed in ionic compounds and in the compounds formed by carbon.
State the reason to explain why covalent compounds "are bad conductors of electricity".
Write the electron-dot structure for the following molecule.
Cl2
Fill in the blank in the following sentence:
In forming N2 molecule, .............. electrons are shared by each atom of nitrogen.
Why is diamond used for making cutting tools (like glass cutters) but graphite is not?
State one use of diamond which depends on its 'extraordinary brilliance' and one use of graphite which depends on its being 'black and quite soft'.
Explain why, diamond has a high melting point.
A covalent molecule having a double bond between its atoms is:
(a) Hydrogen
(b) Oxygen
(c) water
(d) ammonia
Give the characteristic properties of covalent compounds.
Define a coordinate bond and give the conditions for its formation.
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Methanol
Explain the following briefly.
Pure water does not conduct electricity, but on adding sodium chloride to it, it starts conducting electricity.
Choose the correct answer from the options given below
Which one is not example of polar covalent compound?
In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?
Potassium (Atomic No. 19) and chlorine (Atomic No. 17) react to form a compound. On the basis of electronic concept, explain
(i) oxidation
(ii) reduction
(iii)oxidising agent
(iv)reducing agent
Name two compounds that are covalent when taken pure but produce ions when dissolved in water.
Name the types of Hydrocarbons.
A molecule of ammonia (NH3) has
`"CH"_3 - "CH"_2 - "OH" overset("Alkaline""KMnO"_4 + "Heat")(->) "CH"_3 - "COOH"`
In the above given reaction, alkaline KMnO4 acts as
It is observed that covalent compounds are had conductors of electricity. Give reason.
