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Diamond is very hard, because...

Diamond is very hard, because

A

it is covalent solid

B

it has large cohesive energy

C

high melting point

D

insoluble in all solvents

Text Solution

Verified by Experts

The correct Answer is:
B
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Diamond is hard because all the four valence electrons are bonded to four carbon atoms by comvlent bonds .

The number of Carbon compounds is very large because it

Knowledge Check

  • Assertion (A) : Graphite is chemically more reactive than diamond . Reason (R) : Diamond is very hard but fraphite si soof .

    A
    If both (A) and (R) are correct and (R) is correct explanation of (A)
    B
    If both (A) and (R) are correct and (R) is not correct explanation of (A)
    C
    If (A) is correct , but (R) is incorrect
    D
    If (A) is incorrect but (R) is correct .

  • Assertion (A) : Graphite is soft while diamond is very hard . Reason (R) : Graphite has a hree -dimensional structure while diamond has planer struture .

    A
    If both (A) and (R) are correct and (R) is correct explanation of (A)
    B
    If both (A) and (R) are correct and (R) is not correct explanation of (A)
    C
    If (A) is correct , but (R) is incorrect
    D
    If (A) is incorrect but (R) is correct

  • The number of carbon compounds is very large because :

    A
    Carbon is tetravalent
    B
    It has non metallic character
    C
    It shows allotropy
    D
    It has strong catenation property

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    Graphite is soft while diamond is hard because

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    Assertion : Graphite is a good conductor of electricity, however diamond belongs to the category of insulators. Reason : Graphite is soft in nature, on the other hand diamond is very hard and brittle

    Assertion :Graphite is a good conductor of electricity , however diamond belongs to the category of insulators. Reason: Graphite is soft in nature, on the other hand diamond is very hard and brittle

    Statements-I: Diamond is extremely hard and non volatile substance Statement-II: In diamond strong C-C bonding is present throughout the crystal.

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