Elementary and Complex Reactions

Q. In the following reaction :
$2NO+O_2\stackrel{k^{\prime }}{\to }2N{O}_2$
What is the predicted rate law, if the mechanism is given as :
$NO+O_2\stackrel{K_{eq}}{\rightleftharpoons }N{O}_3$ (Fast)
$N{O}_3+NO\stackrel{k_1}{\to }N{O}_2+N{O}_2$ (Slow)

1. $r=k_1{K}_{eq}\left[NO\right]\left[O_2\right]\left[N{O}_3\right]$
2. $r=k_1{K}_{eq}\left[NO\right]\left[O_2\right]$
3. $r=k_1{K}_{eq}\left[NO{]}^2\right[O_2]$
4. $r=k_1{K}_{eq}[NO{]}^2$

Q. A hypothetical reaction :
$A_2+B_2\to 2AB$ follows the following mechanism :
$A_2\iff A+A\left(fast\right)$....K
$A+B_2\to AB+B\left(slow\right)$
$A+B\to AB\left(fast\right)$
The order of the overall reaction is

1. 2
2. $\frac{3}{2}$
3. 1
4. \N

Q. The reaction $A_2+B_2\to 2\mathrm{AB}$, is bound to obey the following mechanism
$A_2\stackrel{k_1}{\underset{k_{-1}}{\rightleftarrows }}A+A\left(\mathrm{fast}\right)$
$A+B_2\stackrel{k_2}{\to }\mathrm{AB}+B\left(\mathrm{slow}\right)$
$A+B\to \mathrm{AB}\left(\mathrm{fast}\right)$
The order of overall reaction is

1. 3
2. 2
3. 2.5
4. 1.5

Q. Samwell has to answer 2 final questions to become the junior Maester. Let's help him.
Elementary reactions are so called because?

1. They are the basic reactions of nature
2. They have just 2 reactants.
3. They take place in a single step.
4. They give rise to exactly one product.

Q. For the reaction $A+B\to C+D$, the variation of the concentration of the products is given by the curve:

1. x
2. y
3. z
4. w

Q. For the reaction $A+B\to C+D$, the variation of the concentration of the products is given by the curve:

1. x
2. y
3. z
4. w

Q.

Samwell is almost done!
Elementary reactions are classified based on?

1. Order
2. Rate constant
3. Molecularity
4. Phase of reactants