t
1/4 can be taken as the time taken for the
concentration of a reactant to drop to 3/4 of its
initial value. If the rate constant for a first order
reaction is K, then t1/4 can be written as –
(A) 0.10 /K (B) 0.29 /K
(C) 0.69/K (D) 0.75 /K