For a first order reaction, the time required for completion of 90% reaction is 'x' times the half life of the reaction. The value of 'x' is

(Given : ln 10 = 2.303 and log 2 = 0.3010)

Which one of the following given graphs represents the variation of rate constant (k) with temperature (T) for an endothermic reaction?

For a reaction of order n, the unit of the rate constant is :

For the following graphs,


Choose from the options given below, the correct one regarding order of reaction is :