When the reaction A rightarrow B + C is studied, a plot of 1/[A] vs. time gives

Question

When the reaction A rightarrow B + C is studied, a plot of 1/[A] vs. time gives a straight line with a positive slope. What is the order of the reaction? (a) zero (b) first (c) second (d) third (e) more information is needed to determine the order of the reaction. From the consideration of the following reaction system: 2 H_2S_(g) + O_2(g) rightarrow 2 S_(g) + H_2O_(g), we can conclude that (a) the reaction is second order in H_2S and zero order in O_2 (b) the reaction is first order in H_2S and second order in O_2 (c) rate = k[H_2S]^2[O_2] (d) rate = k[O_2] (e) none of these conclusions is justified. A reactant B is being consumed in a first-order reaction. What percentage of the initial [B] has been consumed after 4.0 half-lives? (a) 93.8% (b) 87.5% (c) 75.0% (d) 12.5% (e) 6.25%. The activation energy of a reaction can be decreased by (a) raising the temperature (b) adding more reactants (c) adding a catalyst (d) raising the temperature and adding more reactants (e) adding more reactants and decreasing the temperature. The half-life of a reaction is dependent upon the initial concentration of the reactant if the reaction is: (a) zero order (b) first order (c) second order (d) first or second order (e) zero or second order. Which of the following is true for a homogeneous catalyst? It: (a) is all used up during a chemical reaction (b) is also known as a surface catalyst (c) raises the activation energy of a reaction (d) reacts with only certain substrates (e) is dispersed with the reactants in a single phase. Which of the following could be the units for the rate constant of a second order reaction? (a) M/s (b) 1/M-s (c) 1/s (d) 1/M (e) s/M^2.

Explanation / Answer

Ans 1. C . second

For a sceond order reaction 1/A vs T graph has a linear slope.

rate is given as

rate = k[A]2

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