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Select the correct statement(s) from the...

Select the correct statement(s) from the following

A

Graphite is thermodynamically more unstable form of carbon

B

Graphite can be converted into diamond

C

Graphite is used as a moderator in nuclear reactors

D

Graphite is less reactive than diamond

Text Solution

Verified by Experts

The correct Answer is:
B, C
(BC) The heat of combustionof graphite - 94.052 kcal / mole and that of diamond is 94.505 kcal/mole. However, it can be converted into diamond at `16000^(@)C` by a pressure of 5,000 to 60,000 atm
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Knowledge Check

  • An ideal gas is taken from the state A (pressure P, volume V) to the state B (pressure P/2 , volume 2V) along a straight line path in the P-V diagram. Select the correct statements(s) from the following.

    A
    The work done by the gas in the process A to B is negative
    B
    In the T-V diagram, the path AB becomes a part of a parabola
    C
    In the P-T diagram, the path AB becomes a part of a hyperbola
    D
    In going from A to B, the temperature T of the gas first increases to a maximum value and then decreases

  • Select the correct statements(s)

    A
    The rare law of the elementary reaction `2AtoB+C`, must bne Rate `=K[A]^(2)`
    B
    The rate law for the complex reaction `A+BtoC`, might not be Rate `=K[A][B]`
    C
    If the partial orders differ from the coefficients in the balanced reaction, the reaction must be complex.
    D
    If the partial orders equal to corresponding coefficients in the balanced reaction, the reaction must be elementary.

  • Select the correct statements(s)

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    when `Tto prop` or `E_(a)to0`, then K=A
    B
    A positive catalyst can change `DeltaH` of the reaction
    C
    A mixture of reactants may be thermodynamically unstable but kinetically stable.
    D
    A negative catalyst increases the activation energy of the reaction.

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