Chemistry questions
29404 published questions with worked solutions.
- For a chemical reaction A + 2B C if the rate of disappearance of A is 0.5 , mol ,dm^ -3 per hour, the rate of disappearance of B...
- If velocity constant of any reaction [k'] is two times of velocity constant [k''] of other reaction. The rate of activation...
- For the following chemical reaction 2X + Y Z the expression of equilibrium constant will be
- Minimum energy required for molecules to react is called:
- The rate constant of a first order reaction whose half-life is 480 S is :
- For a hypothetical reaction A B the rate constant is 0.25 ,sec^ -1 . If the concentration of A is reduced to half then the value...
- For a General Chemical change 2A + 3B products, the rates with respect to A and B are r_1 and r_2 respectively, are related as
- The Rate Law of the rate constant for the chemical reaction : 2NO_2Cl 2NO_2 + Cl_2 is : rate = K[NO_2Cl]. The rate determining...
- Number of moles of a substances present in one liter volume is known as
- The rate constant for the reaction 2N_2O_5 4NO_2 + O_2 is 3.0 10^ -3 ,S^ -1 . If the rate is 2.40 10^ -5 , mol ,liter^ -1 ,S^ -1...
- For the reaction 2NO_2 + F_2 2NO_2F. Following mechanism has been provided. NO_2 + F_2 Slow NO_2F + F NO_2 + F Fast NO_2F Thus...
- The rate of elementary reaction A B increases by a 100 when the concentration of A is increased ten folds. The order of the...
- The rate constant of n^ th order has units
- The units for the rate constant for the second order reaction [concentration : Mol ,liter^ -1 , time : s] are
- The rate constant of a reaction is 1.2 10^ -5 , Mol^ -2 ,liter^2 ,s^ -1 . The order of the reaction is
- In the sequence of reaction A k_1 B k_2 C k_3 D, k_3 > k_2 > k_1, then the rate determining step of the reaction is
- In the presence of acid, the initial concentration of cane sugar was reduced from 0.2 M to 0.1 M in 5 hrs. and to 0.05 M in 10...
- For the gaseous reaction 2A + B C + D the rate is given by k[A][B]. The volume of the container containing the reaction mixture...
- The rate constant is given by equation k = Ae^ -E_a/RT . Which factor should register a decrease for the reaction to proceed more...
- The rate constant of a zero order reaction is 0.2 , Mol ,dm^ -3 ,hr^ -1 . If the concentration of the reactant after 30 minutes...