(i)A powdered substance (A) on treatment with fusion mixture (Na_2CO_3+KNO_3) gives a green coloured compound (B). (ii)The solution of (B) in boiling water on acidification with dilute H_2SO_4 gives a pink coloured compound ( C). (iii)The aqueous solution of (A) on treatment with excess of NaOH and Bromine water gives a compound (D) (iv)A solution of (D) in conc. HNO_3 on treatment with PbO_2at boiling temperature produced a compound (E) which was of the same colour at that of (C ). Sum of oxidation number of central atom of A,B,C,D & E is:

(i)A powdered substance (A) on treatment with fusion mixture (Na_2CO_3

1.	(i)A powdered substance (A) on treatment with fusion mixture (Na_2CO_3+KNO_3) gives a green coloured compound (B). (ii)The solution of (B) in boiling water on acidification with dilute H_2SO_4 gives a pink coloured compound ( C). (iii)The aqueous solution of (A) on treatment with excess of NaOH and Bromine water gives a compound (D) (iv)A solution of (D) in conc. HNO_3 on treatment with PbO_2at boiling temperature produced a compound (E) which was of the same colour at that of (C ). Sum of oxidation number of central atom of A,B,C,D & E is:
Answer» Solution :(I)`underset((A))(MnSO_4)+ubrace(2Na_2CO_3+2KNO_3)_("FUSION mixture")tounderset("Green COLOURED compound")underset((B))(Na_2MnO_4)+2KNO_2+Na_2SO_4+2CO_2` (II)`3MnO_4^(2-)+4H^(+)tooverset(2MnO_4^-)((C) )+MnO_2+2H_2O` (III)`underset((A))(MN^(2+))+2OH^(-)toMn(OH)_2darr`(white) `Mn(OH)_2darr + Br_2 +2NAOH underset((D))(MnO_2)DARR`(black)+2NaBr+`2H_2O` (iv)`5PbO_2 +2 underset((A))(Mn^(2+))+4H^(+)tounderset((E))(2MnO_4^(-))+5Pb^(2+)+2H_2O`