Order of Reaction

Q. For the reaction A + B $\to$ C, it is found that doubling the concentration of A increases the rate by 4 times and doubling the concentration of B doubles the reaction rate. What is the overall order of the reaction?

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

Q. For a reaction X $\to$ Y, the rate of the reaction has been found to be third order with respect to X. What happens when the concentration of X is doubled.

1. rate become double
2. rate becomes three times
3. rate become six times
4. rate becomes eight times

Q. The equation that describes mathematically the dependence of the rate of reaction on the concentration terms of reactants is $Rateequation$.

1. True
2. False

Q. For reaction: A + B $\to$ Products, the rate if the reaction at various concentration are given below:
$\begin{array}{cccc}Expt.No.& \left(A\right)& \left(B\right)& Rate\\ 1& 0.2& 0.2& 2\\ 2& 0.2& 0.4& 4\\ 3& 0.6& 0.4& 36\end{array}$

1. $Rate=k\left[A{]}^2\right[B]$
2. $Rate=k\left[A\right][B{]}^2$
3. $Rate=k\left[A{]}^2\right[B{]}^2$
4. $Rate=k\left[A{]}^3\right[B]$

Q. Arun setup a reaction in a chemistry lab $[2A\to B]$. All the information he have is, it is a second order reaction. Now he wants to increase the rate of reaction to 16 times. He knows that by increasing the concentration, the rate increases, but he doesn’t know, what is the final concentration have to be? Can you help him finding it?

1. Increase the concentration of A by 2 times.
2. Increase the concentration of A by 3 times.
3. Increase the concentration of A by 8 times.
4. Increase the concentration of A by 4 times.

Q. The rate equation for the reaction 2A + B $\to$ C is found to be a : r = k[A][B]. The correct statement in relation of this reaction is that the

1. Rate of formation of C is twice the rate of disappearance of A
2. Value of k is independent of the initial concentration of A and B
3. $t_{\frac{1}{2}}$ is a constant
4. Unit of k is $s^{-1}$

Q. Karthik doing a reaction $(3A\to B.)$ in a chemistry lab. He wants to find the order of the reaction by changing concentrations of A and observing the rate of the reaction. The first observation he did was by increasing the concentration of A by 4 times the rate of reaction is doubled. Can you answer the order of reaction using karthik’s experimental observation?

1. 1
2. 0.5
3. 2
4. 1.5

Q.

Which one of the following statement(s) is incorrect about order of reaction?

1. It is not affected with stoichiometric coefficient of the reactants

2. Order cannot be fractional

3. Order of reaction is determined experimentally

4. Order of reaction is equal to sum of the power of concentration terms in differential rate law

Q. Rate constant for $n^{th}$ order reaction has dimensions:
(Where M is concentration units)

1. $tim{e}^{1-n}{M}^{-1}$
2. $tim{e}^{-1}{M}^{(1-n)}$
3. $tim{e}^1{M}^{(1-n)}$
4. $tim{e}^{-1}{M}^{1+n}$

Q.

For a reaction $A+B\to C$, the rate law is written as $r=k{\left[A\right]}^2\left[B\right]$ . Doubling the concentration of ‘$A$’ without changing concentration of ‘$B$’ increases the rate of reaction by

1. 2 times

2. 4 times

3. 8 times

4. 16 times

Q.

what is rate of reaction?

Q.

The rate law expression for four reactions are give below. In which case, the percentage increase in the rate of reaction would be maximum when the concentration of A is doubled?

1. $r=k\left[A\right]$
2. $r=k[A{]}^{\frac{3}{2}}$
3. $r=k[A{]}^{\circ }$
4. $r=k[A{]}^2$