Chemistry questions
29404 published questions with worked solutions.
- The rate of reaction is determined by slow step reaction. The step is called ________
- In the reaction: H_ 2(g) +Br_ 2(g) 2HBr_ (g) Experimental data suggests that Rate =k[ H_2 ][ Br ]^ 1/2 , hence molecularity and...
- Which of the following statement regarding catalyst is FALSE?
- A catalyst, (i) Increases the average kinetic energy of the molecules (ii) Decreases the activation energy (iii) Alters the...
- The rate law for elementary reaction A+2B C+2D will be ________
- Reaction A+B C+D +38 kcal has activation energy 20 kcal. Activation energy for the reaction C+D A+B is _________
- In the formation of sulphur trioxide by the contact process, 2SO_ 2(g) +O_ 2(g) 2SO_ 3(g) The rate of reaction is expressed as -...
- In a chemical reaction 2A+B C+D . Find the INCORRECT statement
- The rate of a reaction is expressed in different ways as follows + 12 d[C] dt =- 15 d[D] dt =+ 13 d[A] dt =- d[B] dt the reaction...
- In a catalytic reaction N_2+3H_2 2NH_3 (all in gaseous state) rate = [ NH_3 ] t =4.0 10^ -4 mole ,L^ -1 ,s^ -1 The rate of...
- 75% of a first order reaction is completed in 30 minutes. What is the time (in minutes) required for 93.75% of the reaction to be...
- Which of the following represents the expression for 3/4^ th life of 1st order reaction?
- A first order reaction requires 30 minutes for 50% completion. The time required to complete the reaction by 75% will be _________
- The conversion of A B follows second order kinetics. Doubling the concentration of A will increase the rate of formation of B by...
- A first order reaction with respect to the reactant A has a rate constant of 6 s^ -1 . If we start with [A]=0.5 mol/litre, then...
- Half life period of a first order reaction is 10 minutes. How much time is needed to change the concentration of reactants from...
- For a reaction A+B Products, it was found that rate of reaction increases four times if concentration of ‘A’ is doubled, but the...
- For a first order reaction, the ratio of time to complete 99.9% and half of reaction is _________
- Hydrolysis of cane sugar in presence of acid is a first order reaction with half life time of 4 hours. What fraction of sucrose...
- For a zero order reaction, the plot of [A] versus t is linear with a ________