If 0.1 M of a weak acid is taken, and its percentage of degree of ionization is 1.34%, then its ionization constant will be : (a) 0.8 × 10–5 (b) 1.79 × 10–5 (c) 0.182 × 10–5 (d) none of the above [AMU 2002; AFMC 2005]