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Statement-1. The dissociation of NH(3) o...

Statement-1. The dissociation of `NH_(3)` on hot platinum surface may be reaction of zero order or first order.
Statement-2. Pressure of the gas affects the order of reaction.

A

Statement-1 is True, Statement-2 is True , Statement-1 is a correct explanation of Statement-1.

B

Statement-1 is True, Statement-2 is True , Statement-2 is NOT the correct explanation of Statement-1.

C

Statement-1 is True, Statement-2 is False.

D

Statement-1 is False, Statement-2 is True.

Text Solution

Verified by Experts

The correct Answer is:
A
At low pressure, it is first order reaction while at high pressure, it is a zero order reaction.
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Decomposition of NH_(3(g)) on platinum surface at high temperature is a zero order reaction. Explain.

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Knowledge Check

  • For a zero order reaction

    A
    The time taken for half the reaction to complete is inversely proportional to its rate constant
    B
    The time taken for half-change is directly proportional to its initial concentration
    C
    The time taken independent of initial concentration
    D
    There is no effect on the rate of reaction if concentration of reactants is doubled.

  • Correct order for a first order reaction is

    A
    `T_(50) lt T_(av) lt T_(75)`
    B
    `T_(50) lt T_(75) lt T_(av)`
    C
    `T_(av) lt T_(50) lt T_(75)`
    D
    `T_(av) = T_(50) lt T_(75)`

  • For a zero order reaction , ______.

    A
    the concentration of the reactant remains constant during the reaction
    B
    the concentration changes only when the termperature changes
    C
    the rate remains constant throughout the reaction
    D
    the rate of the reaction is proportional to the concentration of reactants

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    a) Derive expression for the half period of first order reaction. b) Given an exmaple of zero order reaction.

    For a zero order reaction, The rate becomes double when the order of the reaction.

    Assertion : The decomposition of gaseous ammonia on a hot platinum surface is a zero order reaction at high pressure. For a zero order reaction the rate of reaction is independent of initial concentration.

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