Some reactions are given in Column I and their n-factor and strength is given in Column II & III respectively.

column I	column II	Column III
(I) 9.8% H2SO4 by weight (d = 1.8 g ml-1)	(i)n - factor = 3	(P) 3.6 N
(II) 9.8% H3PO4 by weight ( d = 1.2 g ml-1)	(ii)n - factor = 1	(Q) 1.2 M
(III) 1.8 NA molecules of HCl in 500 ml	(iii) n - factor = 2	(R) 1.8 equiv.
(IV)250 ml of 4 N NaOH + 250 ml of 1.6 M Ca(OH)2	(iv) n - factor = 4	(S) 1.10 m