Statement A: Half-life period of a reaction of first order is independent of initial concentration.Statement B: Half-life period for a first order reaction t1/2=2.303Klog⁡2.

For a first order reaction, K=2.303tlog⁡aa−x, where a is initial concentration, and x is the amount reacted in time t. For half-life x=a/2, t=t1/2K=2.303Klog⁡aa−a/2t1/2=2.303Klog⁡2=0.693K.