List of top Chemistry Questions

For the reaction A + B $\rightarrow$ C + 2D , experimental results were collected for three trials and the data obtained are given below. The correct rate law of the reaction is
The rate law for the reaction $xA + yB \longrightarrow mP + nQ$ is rate = $k [A]^c[B]^d.$ What is the total order of the reaction?
In a zero order reaction for every $10^{\circ}$C rise of temperature, the rate is doubled. If the temperature is increased from $10^{\circ}$C to $100^{\circ}$C, the rate of the reaction will become .
The unit, $mol \, L^{-1} \, s^{-1}$ is meant for the rate constant of the reaction having the order
The half-life of a reaction is inversely proportional to the square of the initial concentration of the reactant. Then the order of the reaction is
$ln \frac{k_2}{k_1} = - \frac{E_a}{R} \bigg( \frac{1}{T_2} - \frac{1}{T_1} \bigg) $Consider the following statements : $1$. increase in concentration of reactant increases the rate of a zero order reaction $2$. rate constant $k$ is equal to collision frequency $A$ if $E_a = 0$. $3$. rate constant $k$ is equal to collision frequency $A$ if $E_a = \infty$ $4$. In $k\, vs\, T$ is a straight line $5$. In $k\, vs\, 1/T$ is a straight line Correct statements are
The potential energy diagrams for four reactions are given below Which one of the following statements about these diagrams is incorrect?
The rate constant for a first order reaction becomes six times when the temperature is raised from 350 K to 400 K. Calculate the activation energy for the reaction $ ( R = 8.314 JK^{ - 1} \, mol^{ - 1} )$
$t_{1/2}$ for a first order reaction is $14.26\, min$. Calculate the time when $5\%$ of the reactant is left.
99% of a first order reaction was completed in 32min. When will 99.9% of the reaction complete ?
A first order reaction is $20\%$ complete in $10$ minutes. What is the specific rate constant for the reaction?
A first order reaction is $50$% complete in $30$ minutes at $27?C $ and in $10$ minutes at $47?C$. The reaction rate constant at $27?C$ and the energy of activation of the reaction are respectively
A first order reaction takes $40$ min for $30\%$ decomposition. What will be $t_{1/2}$?
A following mechanism has been proposed for a reaction 2A + B$\to$ D + EA + B$\to$ C + D (slow)A + C $\to$ E (fast) .The rate law expression for the reaction is
A reaction is 50% complete in 2 hours and 75% complete in 4 hours the order of reaction is
A schematic plot of ln $k_{eq}$ versus inverse of temperature for a reaction is shown in the figure. The reaction must be
A substance A decomposes in solution following the first order kinetics. Flask I contains 1 L of 1 M solution of A and flask II contains 100 mL of 0.6 M solution. After 8 hr the concentration of A what will be the timefor concentration of A in flask II to become 0.3 M
A substance undergoes first order decomposition. The decomposition follows two parallel first order reactions as : $If k_{1}=1.26\times10^{-4} s^{-1}, k_{2}=3.8 \times10^{-5} s^{-1},$ then the percentage distributions of B and C are respectively
A zero order reaction is one whose rate is independent of
Among the following reactions, the fastest one is
Order of a reaction with respect to any reactant can be zero, positive, negative or fractional Rate of a reaction cannot decrease with increase in concentration of a reactant or a product.
In a pseudo first order hydrolysis of ester in water, the following results were obtained. What will be the average rate of reaction between the time interval $30$ to $60$ seconds?
Collision theory is applicable to
Consider the reaction Consider the reaction $A$ $\rightarrow$ $B$. The concentration of both the reactants and the products varies exponentially with time. Which of the following figures correctly describes the change in concentration of reactants and products with time?
For a hypothetical reaction A$\to$ B, the rate constant is $0.25\, sec^{-1.}$ If the concentration of A is reduced to half, then the value of rate constant is