Question

For the following reaction: NO₂(g) + CO(g) → NO(g) +
CO₂(g), the rate law is: Rate = k [NO₂]². If 0.1 mole of gaseous
carbon monoxide is added at constant temperature to the
reaction mixture which of the following statements is true?
(a) Both k and the reaction rate remain the same
(b) Both k and the reaction rate increase
(c) Both k and the reaction rate decrease
(d) Only k increases, the reaction rate remain the same

Answer 1

a is the answer

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Answer 2

In the given reaction, if 0.1 mole of gaseous carbon monoxide is added at constant temperature to the reaction mixture , both K and the rate of the reaction remains the same.

• 'K' is the rate constant of the reaction and rate constant of a given reaction is only a function of temperature. Since the temperature is kept constant the value of 'K' does not change.
• The rate of the reaction does not depend on the concentration of carbon monoxide, as is visible from the rate law given to us. Therefore, any change in concentration of carbon monoxide will not induce change in the rate of the reaction.