(b) If 1.00 tonne of soda ash and 0.55 tonne of chlorine (both are to be considered as saleable products) are obtained from 1.20 tonne of NaCl, 0.95 tonne of sulphuric acid, 0.96 tonne of limestone and 0.62 tonne of coke through integration of the Leblanc and Deacon processes, the E-factor for the process is (i) 1.0 (ii) 1.4 (iii) 1.8 (iv) 2.2