Chemistry questions
29404 published questions with worked solutions.
- Consider the reaction 2N_2O_ 5(g) 4NO_ 2(g) +O_ 2(g) in liquid bromine. If - d[N_2O_5] dt =0.02 M ,s^ -1 then NO_2 is formed at...
- t_ 1/4 can be taken as the time taken for the concentration of a reactant to drop to 34 of its initial value. If the rate...
- The half life of a substance in a certain enzyme-catalysed reaction is 138 s. The time required for the concentration of the...
- Consider a reaction aG+bH Products. When concentration of both the reactants G and H is doubled, the rate increases by eight...
- Half life period of a first-order reaction is 1386 seconds. The specific rate constant of the reaction is _____ [CBSE PMT 2009]
- Which one of the following statement is NOT correct for order of reaction? [IIT JEE 2005, CBSE PMT (Prelims) 2011]
- The rate of the reaction A Products, at the initial concentration of 3.24 10^ -2 M is nine times its rate at another initial...
- For the non-stoichiometric reaction 2A + B C + D, the following kinetic data were obtained in three separate experiments, all at...
- The unit of rate constant for certain reaction is time^ -1 . The order of the reaction is _____
- If ‘a’ and "t_ 1/2 " are initial concentration of reactant and half-life of a zero order reaction respectively, which of the...
- Under the same reaction conditions, initial concentration of 1.386 mol ,dm^ -3 of a substance becomes half in 40 seconds and 20...
- The rate constant of a first order reaction is 3 10^ -6 per second. If the initial concentration is 0.10 M , the initial rate of...
- If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately _____...
- Rate law for the reaction A+B Product is rate =k[A]^2[B]. What is the rate constant, if rate of reaction at a given temperature...
- Units of rate constant of first and zero order reaction in terms of molarity M unit are respectively _____ [AIEEE 2002]
- For a first order reaction, the time taken to reduce the initial concentration by a factor of 14 is 20 minutes. The time required...
- The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the...
- The reaction, X Product follows first order kinetics. In 40 minutes the concentration of X changes from 0.1 M to 0.025 M. Then...
- A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon...
- T_ 50 of first-order reaction is 10 min. Starting with 10 mol ,L^ -1 , rate after 20 min is _____ [AIIMS 2008]