A reaction is second order in A and first order in B.
(i) Write the differential rate equation.
(ii) How is the rate affected on increasing the concentration of A three times?
(iii) How is the rate affected when the concentrations of both A and B are doubled?
A first order reaction takes 40 minutes for 30% decomposition. Calculate t1/2 for this reaction.
(Given log 1.428 = 0.1548)
For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.
Give reasons for the following:
(i) Bond enthalpy of F2 is lower than that of Cl2.
(ii) PH3 has lower boiling point than NH3Account for the following:
(i) Helium is used in diving apparatus.
(ii) Fluorine does not exhibit positive oxidation state.
(iii) Oxygen shows catenation behaviour less than sulphur
What happens when CH3-Br is treated with KCN?
It is a nucleophilic substitution reaction. The nucleophile CN- substitutes Br- because cyanide is strong nucleophile than bromide. The reaction is as follows:
CH3-Br+KCN --> CH3-CN+HBr