Chemistry Question Bank

...A… depends upon the change in concentration of reactants or products and the time taken for that change to occur. Here, A is

The correct expression is

The square brackets in the expression Δ[R] = [R]2 – [R]1 are used to express …A… Here, A is

Speed of a reaction can be defined as

The units of rate of reaction are

Rate of a reaction

The rate of reaction is defined as

For a reaction R ⟶ P, the concentration of a reactant changes from 0.05 M to 0.04 M in 30 minutes. What will be the average rate of reaction in minutes?

For the reaction A + 2B ⟶ C, the rate of reaction at a given instant can be represented by (a) d[A] 1 d[B] d[C] dt 2 dt dt

For the reaction. 2 HI ⟶ H2 + I2, the expression [ ] d HI dt represents

In a reaction 2HI ⟶ H2 + I2, the concentration of HI decreases from 0.5 mol L–1 to 0.4 mol L–1 in 10 minutes. What is the overall rate of reaction during this interval?

The rate constant of a first order reaction is 15 ×10-3 s–1. How long will 5.0 g of this reactant take to reduce to 3.0 g?

Chemical kinetics plays an important role in

For a general reaction X -> Y, the plot of conc. of X vs time is given in the figure. What is the order of the reaction and what are the units of rate constant?

If ‘a’ is the initial concentration of the reactant, the time taken for completion of the reaction, if it is of zero-order, will be

The correct expression for the rate constant for reactions of zero-order is

For a first order reaction, (A) -> product the concentration of A changes from 0.1 M to 0.025 M in40 min. The rate of reaction when the concentration of A is 0.01 M is

In a first order reaction the concentration of reactant decreases from 800 mol/dm3 to 50 mol/dm3 in 2 × 104 sec. The rate constant of reaction in sec–1 is:

In a first order reaction, reactant concentration ‘C’ varies with time ‘t’ as

The half-life period of a first order reaction is

What will be the half-life of the first order reaction for which the value of rate constant is 200 s–1?

For a given reaction half life period was found to be directly proportional to the initial concentration of the reactant. The order is

…A… of the reaction is the time in which the concentration of a reactant is reduced to one half of its initial concentration. Choose the appropriate word to fill ‘A’ from the options given below.

1/2 t for a zero order reaction is …(I)… proportional to the initial concentration of the reactants and …(II)… proportional to the rate constant. Choose the correct words to fill up the blanks (I) and (II) respectivel…

Value of 1/2 t for first order reaction is (a) (b) (c) (d) Ans. (a) Sol. Value of t1/2 for first order reaction is 0.693 k