Match the reaction in column I with titration method in column II and select answer from the answer code

	Column I		Column II
I)	$\begin{array}{r}2{\mathrm{S}}_2{\mathrm{O}}_3^{2-}+{\mathrm{I}}_2\to {\mathrm{S}}_4{\mathrm{O}}_6^{2-}+2{\mathrm{I}}^{-}\end{array}$	1	Redox with self indicator
II)	$\begin{array}{r}\mathrm{Mn}{O}_4^{-}+{\mathrm{Fe}}^{2+}+{\mathrm{H}}^{+}\to {\mathrm{Mn}}^{2+}+{\mathrm{Fe}}^{3+}+{\mathrm{H}}_2\mathrm{O}\end{array}$	2	Dumas method
III)	${\mathrm{NH}}_4^{+}+{\mathrm{OH}}^{-}\to 2{\mathrm{NH}}_3+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\left({\mathrm{NH}}_4\right)}_2{\mathrm{SO}}_4$	3	Iodimetric
IV)	${\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}+{\mathrm{I}}^{-}+{\mathrm{H}}^{+}\to {\mathrm{Cr}}^{3+}+{\mathrm{I}}_2+{\mathrm{H}}_2\mathrm{O}$	4	Kjeldahl

	I	II	III	IV
1)	1	4	2	3
2)	3	4	1	2
3)	1	3	2	4
4)	3	1	4	3