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In an .aqua regia. quiz competition the ...

In an .aqua regia. quiz competition the quiz master asked one of the teams to name the two hardest substances one of which is naturally occurring and the other one is manmade. As none of the teams could give the answer, he gave a clue that both the substances are used for cut-ting glass and drilling rocks and contain one common element. Then one of the teams gave the answer. What could be the right answer?

Text Solution

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Diamond and silicon carbide are the two hardest substances known. Diamond occurs naturally (one is diamond and the other is silicon carbide) as it is obtained by the reaction between carbon and silicon. The common element present in diamond and silicon carbide is carbon.
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In 'Aqua Regia' quiz competition the quiz master asked one of the teams to name the two hardest substances one of which is naturally occurring and the other one is manmade. As none of the teams could give the correct answer. he gave a clue that both the substances are used for cutting glass and drilling rocks and contain one common element. Then one of the teams gave the correct answers. What could be the right answer ?

Allotrope of carbon used in cutting glass and rock drilling.

Knowledge Check

  • Of the following substances the one which does not contain oxygen is

    A
    bauxite
    B
    epsom salt
    C
    cryolite
    D
    dolomite

  • Which one is the hardest natural substance among the following?

    A
    coal
    B
    coke
    C
    diamond
    D
    fullerene

  • Which one of the following allotropes of the carbon is used in cutting and drilling

    A
    Diamond
    B
    Graphite
    C
    Activated charcoal
    D
    Carbon black

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