The reaction 2SO_3(g) 2SO_2(g) + O_2(g) is endothermic. If the temperature is in
ID: 1020329 • Letter: T
Question
The reaction 2SO_3(g) 2SO_2(g) + O_2(g) is endothermic. If the temperature is increased, A) more SO_3 will be produced. B) K_c will decrease. C) no change will occur in K_c. D) K_c will increase. E) the pressure will decrease. For the overall chemical reaction shown below, which one of the following statements can be rightly assumed? 2H_2S(g) + O_2(g) rightarrow 2S(s) + 2H_2 O(l) A) The reaction is third-order overall. B) The reaction is second-order overall. C) The rate law is, rate = k[H_2 S]^2 [O_2]. D) The rate law is, rate = k[H_2 S][O_2]. E) The rate law cannot be determined from the information given. For the reaction A + 3B rightarrow 2C, the rate of disappearance of B given by (Delta [B]/Delta t) may also be expressed as A) Delta [B]/Delta t = -(1/3) Delta [A]/Delta t B) Delta [B]/Delta t = -3 Delta [A]/Delta t C) Delta [B]/Delta t = 3 Delta [A]/Delta t D) Delta [B]/Delta t = (1/3) Delta [A]/Delta t E) Delta [B]/Delta t = -Delta [A]/Delta t Concerning the rate law, Rate = k[A][B], what are appropriate units for the rate Constant k? A) s^-1 B) M^-1 s^-1 C) M^-2 s^-1 D) M/s E) M^2/s Appropriate units for a second-order rate constant are A) M/s B) 1/M middot s C) 1/s D) 1/M^2 middot s For the chemical reaction A rightarrow B + C, a plot of [A]_t versus time is found to give a straight line with a negative slope. What is the order of reaction with respect to A? A) zero B) first C) second D) third E) Such a plot cannot reveal the order of the reaction.Explanation / Answer
35. 2SO3(g) <===> 2SO2(g)+O2(g)
Kc = [SO2]^2[O2]/[SO3]^2
as the reaction is endothermic, if temperature increases the forward reaction is favourable.so that
forward reaction is favourable. so that concentration of products increases,reactants decreases.that will increase Kc
answer: D
36. order of reaction can not be determined directly. it is an experimental phenomena.so that
it is not possible to determine the rate law from the given data
answer: E
37.
A + 3B ---> 2 C
rate = -D[A]/dt = -1/3D[B]/dt = +1/2D[C]/dt
D[B]/dt = -3D[A]/dt
answer : B
38. rate = k[A][B]
K = rate/[A][B] = (M/S)/(M^2) = M-1.S-1
answer: B
40. answer: A
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