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Carbon acts as an abrasive and also as a...

Carbon acts as an abrasive and also as a lubricant, explain.

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Knowledge Check

  • Which one of the following can also act as a lubricant in the machines?

    A
    Iron fillings
    B
    Polish on machines
    C
    Flow of waler through the machine
    D
    Flow of compressed and purifie air.

  • Carbon monoxide acts as a donor and reacts with certain metals to give carbonyls. This is due to

    A
    presence of one sigma and two pi bonds between C and O `( :C -= O: )`
    B
    presence of a lone pair on carbon atom in CO molecule
    C
    Presence of lone pair on oxygen atom in CO molecule
    D
    Poisonous nature of CO

  • When two surfaces are coated with a lubricant, then they

    A
    stick to each other
    B
    slide upon each other
    C
    roll upon each other
    D
    none of the these
    • VMC MODULES ENGLISH-p-BLOCK ELEMENTS-1-JEE Advanced Archive
    1. Carbon acts as an abrasive and also as a lubricant, explain.

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    2. Moderate electrical conductivity is shown by

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    3. Give reason for the following in one or two sentences : ''Solid carbon...

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    4. Carbon tetrachloride burns in air when lighted ti give phosgene.

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    5. Give reasons Graphite is used as lubricant.

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    6. Graphite is used as a lubricant in machinery.

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    7. All the Al-Cl bonds in Al(2)Cl(6) are equivalent.

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    8. Each entry in column X is in some way related to the entries in column...

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    9. Write the balanced equation for the preparation of crystalline silicon...

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    10. The hydrolysis of alkyl substituted chlorosilanes gives .

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    11. The tendency for catenation is much higher for C than for Si.

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    12. The basic nature of the hydroxides of group 13 decreases progressively...

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    13. Diamond is

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    14. One recently discovered allotrope of carbon (e.g. C(60)) is commonly k...

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    15. The hydrolysis of trialkylchlorosilane , R3 SiCl, yields ……………………..,

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    16. Which of the following oxides is neutral ?

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    17. Which of the following halides is least stable and has doubtful existe...

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    18. Aluminium sulphide gives a foul odour when it becomes damp. Write a ba...

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    19. Anhydrous AlCl(3) is covalent from the data given below, perdict wheth...

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    20. A liquid which is permanently supercooled is frequently called a ……….....

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