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Assertion (A) : Graphite is chemically ...

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 .

Text Solution

Verified by Experts

The correct Answer is:
B
Correct reason : `C` in graphite is `sp^2` hybridised , whereas in diamond `C, is ` sp^3` hydridised .
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Diamond is harder than graphite.

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Knowledge Check

  • 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

  • Diamond is harder than graphite because

    A
    Graphite is planar
    B
    Diamond has free electron
    C
    Graphite is `sp^(3)` hybridised
    D
    None of these

  • Assertion (A): CIF is more reactive than F_(2) . Reason (R ): The F-F bons is weaker than CIF bond.

    A
    If both (A) and (R ) are correct and (R ) is the correct explanation of (A).
    B
    If both (A) and (R ) are correct and (R ) is the correct explanation of (A).
    C
    If (A) is correct, but (R ) is incorrect.
    D
    If (A) is incorrect, but (R ) is correct.

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    Assertion (A): Enthalpy of graphite is lower than that of diamond. Reason (R ) : Entropy of graphite is lower than that of diamond.

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    Assertion (A) : P_(4) is more reactive than N_(2) Reason (R) : P-P bonds are relatively weaker than N-=N

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