Rate Constant

Q.

The minimum energy that two molecules should possess so that their collisions result in a chemical reaction is called _______ energy.

Q. What is the formula of reaction time

Q. The temperature coefficient of a reaction is 2. The rate of this reaction on raising temperature by 25 K shall increase by how many times?

Q.

How do you find the activation energy given two temperatures?

Q. Half life of a first order reaction is 10 min.what % of reaction will be completed in 100 min?

Q. The gaseous reaction $A_{\left(g\right)}\to 2B_{\left(g\right)}+C_{\left(g\right)}$ is found to be first order with respect to $A$. If the reaction is started with $p_A=90mmHg$, the pressure after $10$ minutes found to be $180mmHg$. The rate constant of the reaction is?

1. $2.30\times {10}^{-3}{s}^{-1}$
2. $1.15\times {10}^{-3}{s}^{-1}$
3. $3.45\times {10}^{-3}{s}^{-1}$
4. $4.60\times {10}^{-3}{s}^{-1}$

Q. A gaseous reaction A(g) $\leftrightarrow$ 2B(g) + C(g) is found to be of first order. If the reaction is started with p_A = 90 mm Hg, the total pressure after 10 min is found to be 180 mm Hg. The rate constant of the reaction is

1. $4.60\times {10}^{-3}{s}^{-1}$
2. $6.9\times {10}^{-2}{s}^{-1}$
3. $1.15\times {10}^{-3}{s}^{-1}$
4. $4.90\times {10}^{-3}{s}^{-1}$

Q. Rate constant for the reaction 2N2O5 ? 4NO2 + O2 is 4.98 x 10-4 s -1 Find the order of reaction?

Q.

A drop of solution (volume = 0.050 mL) contains $6\times {10}^{-7}molof{H}_3{O}^{+}$ ions. If $H_3{O}^{+}$ions disappear at a constant rate of $6.0\times {10}^5$ mol $L^{-1}{S}^{-1}$, how long will take for the $H_3{O}^{+}$ ions in the drop to disappear ?

1. $2.0\times {10}^{-2}s$

2. $6.0\times {10}^{-6}s$

3. $2.0\times {10}^{-8}s$

4. $8.0\times {10}^{-8}s$

Q.

The following data pertains to reaction between A and B :
$\begin{array}{cccc}S.NO.& \left[A\right]mol{L}^{-1}& mol{L}^{-1}& Rate\left(mol{L}^{-1}tim{e}^{-1}\right)\\ 1& 1.0\times {10}^{-2}& 2.0\times {10}^{-2}& 2.0\times {10}^4\\ 2& 2.0\times {10}^{-2}& 2.0\times {10}^{-2}& 4.0\times {10}^{-4}\\ 3& 2.0\times {10}^{-2}& 4.0\times {10}^{-2}& 8.0\times {10}^{-4}\end{array}$
Which of the following inference(s) can be drawn from the above data ?

1. Rate constant of the reaction is $1.0\times {10}^{-4}$

2. Rate law of the reaction is: rate $=k\left[A\right]\left[B\right]$

3. Rate of reaction increases four times on doubting the concentration of both the reactants.

Select the correct answer using the codes given below:

1. 1, 2 and 3

2. 1 and 2

3. 3 only

4. 2 and 3

Q. Rate law fora chemical reaction is:
Rate $=k\left[A{]}^{1/2}\right[B]$
Choose the correct options among the following.

1. Unit of its rate constant is $litr{e}^{1/2}mo{l}^{-1/2}se{c}^{-1}$
2. Order of the reaction is $\frac{3}{2}$
3. Unit of rate is $litr{e}^{-1}se{c}^{-1}$
4. Its molecularity is always $3$

Q. if a complex rxn has multiple slow reactions, how will we decide for the rate-determining step? will we take the slowest of the slow reactions?

Q. In Samwell's classes, the Maesters made the following statements. He had to figure out how many were right. Can you help him?

Maester 1 said: Rate constant is characteristic of a reaction
Maester 2 said: Rate constant is dependent on temperature
Maester 3 said: Rate constant is not dependent on the catalyst

1. One was right
2. Two were right
3. Three were right
4. None were right