Question
Complete the following reactions.
$$\left( {\text{i}} \right)C{r_2}O_7^{2 - } + 3S{O_2} + 2{H^ + } \to $$ $$2C{r^{3 + }} + \_\_\_ + {H_2}O$$
$$\left( {{\text{ii}}} \right)2MnO_4^ - + 5SO_3^{2 - } + 6{H^ + } \to $$ $$2M{n^{2 + }} + \_\_\_ + 3{H_2}O$$
$$\left( {{\text{iii}}} \right)C{r_2}O_7^{2 - } + 6F{e^{2 + }} + 14{H^ + } \to $$ $$2C{r^{3 + }} + \_\_\_ + 7{H_2}O$$
A.
$$3SO_4^{2 - },SO_2^{2 - },F{e^{3 + }}$$
B.
$$3SO_4^{2 - },5SO_4^{2 - },6F{e^{3 + }}$$
C.
$$3SO_4^{2 - },S{O_2},{K^ + }$$
D.
$$S,S{O_2},F{e^{3 + }}$$
Answer :
$$3SO_4^{2 - },5SO_4^{2 - },6F{e^{3 + }}$$