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How Does Graphite Act as a Lubricant? - Science

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प्रश्न

How does graphite act as a lubricant?

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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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पाठ 4: Carbon And Its Compounds - Exercise 1 [पृष्ठ २२१]

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लखमीर सिंह Chemistry (Science) [English] Class 10
पाठ 4 Carbon And Its Compounds
Exercise 1 | Q 9 | पृष्ठ २२१

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

Write the number of covalent bonds in the molecule of butane, C4H10.


Explain the bonding in methane molecule using electron dot structure.


Buckminsterfullerene is spherical molecule in which 60 carbon atoms are arranged in interlocking hexagonal and pentagonal rings of carbon atoms.
How many pentagons of carbon atoms are present in one molecule of buckminsterfullerene?


What would be the electron-dot structure of carbon dioxide which has the formula CO2?


Fill in the blank in the following sentence:

In forming N2 molecule, .............. electrons are shared by each atom of nitrogen.


Why is graphite used for making dry cell electrodes but diamond is not?

 

Explain why, diamond is hard while graphite is soft (though both are made of carbon atoms).

 

The solution of one of the following compounds will not conduct electricity. This compounds is:
(a) NaCl
(b) CCl4
(c) MgCl2
(d) CaCl2


A solid element X has four electrons in the outermost shell of its atom. An allotrope Y of this element is used as a dry lubricant in machinery and also in making pencil leads.
(a) What is element X?
(b) Name the allotrope Y.
(c) State whether allotrope Y is a good conductor or non-conductor of electricity.
(d) Name one use of allotrope Y (other than lubrication and pencil leads)
(e) Name two other allotropes of element X.


Complete the following:

When the nuclei of two different reacting atoms are of ______ mass, then a bond so formed is called ______ covalent bond. (equal, unequal, polar, non-polar)


Give two example in following case:
Liquid non polar compounds


Write answer as directed.
What causes the existance of very large number of carbon compound ?


Explain the following briefly:
Cl2 is a non polar molecule, while HCl is a polar molecule.


Name two compounds that are covalent when taken pure but produce ions when dissolved in water.


Give an example of the covalent bond formed by

(i) Similar atoms (ii) Dissimilar atoms 


Generally, the melting and boiling point of carbon compounds are found to be less than _______ °C.


Which of the following is the purest form of carbon?


Which of the following statements are correct for carbon compounds?

  1. Most carbon compounds are good conductors of electricity.
  2. Most carbon compounds are poor conductors of electricity.
  3. Force of attraction between molecules of carbon compounds is not very strong.
  4. Force of attraction between molecules of carbon compounds is very strong.

An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following


`"CH"_3 - "CH"_2 - "OH" overset("Alkaline""KMnO"_4 + "Heat")(->) "CH"_3 - "COOH"`

In the above given reaction, alkaline KMnO4 acts as 


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