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5/35 MCQs for:
Reaction Kinetics
In acidic solution, the breakdown of sucrose into glucose and fructose has this rate law: rate k[H⁺][sucrose]². The initial rate of sucrose breakdown is measured in a solution that is 0.01 M H⁺, 1.0 M sucrose, 0.1 M fructose, and 0.1 M glucose. By what factor does the rate change if :
[H⁺] is changed to 0.0001 M?

The gaseous reaction

2X + Y → X2Y

takes place in two steps:

i) X + Y → (fast step) XY,

ii) XY +X → (fast step) X2Y

The rate equation is given by:

For the reaction:

X2 + Y + Z → XY + XZ

It is found that halving the concentration of X2 reduces the reaction rate by a factor of 0.5, tripling the concentration of Y, the reaction rate increases by a factor of 9 and doubling the concentration of Z, has no effect on the rate. The rate law for this reaction is:

At a particular temperature, two gases, A (represented by circles) and B (represented by squares), react to form products. The following molecular scenes represent starting mixtures for four experiments run at the same volume, labeled 1 through 4, with their initial rates (in mol L⁻¹s⁻¹):

The predicted initial rate of experiment 4 is:

In a chemical reaction, a collision may occur with energy greater than or equal to activation energy, but fails to yield products. This could be explained by the fact that: