(1) The order of reaction is one:
The order of reaction refers to the mathematical relationship between the rate of a chemical reaction and the concentration of reactants. In this case, the rate equation for the reaction is given as rate of reaction = [Χ] [Υ]. Since the concentration terms are multiplied together, this indicates that the reaction is first-order with respect to both reactants Χ and Υ. Therefore, statement (1) is incorrect.
(2) The molecularity of the reaction is two:
Molecularity refers to the number of molecules involved in the rate-determining step of a chemical reaction. In this case, the rate equation includes two concentration terms [Χ] and [Υ], suggesting that the reaction involves the collision of two molecules (one of Χ and one of Υ) in the rate-determining step. Therefore, statement (2) is correct.
(3) The rate constant depends upon temperature:
The rate constant (k) in a rate equation represents the proportionality constant between the concentration of reactants and the rate of reaction. It is determined by various factors, including the nature of the reaction, the presence of catalysts, and temperature. In general, the rate constant increases with increasing temperature due to the higher kinetic energy of molecules, leading to more frequent and energetic collisions. Therefore, statement (3) is correct.
Based on the detailed analysis, the correct answer is option (3) 2 and 3 are correct.
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