(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 boilin

Question

(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 boilin

(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_2` at 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:

Monjur Alahi

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2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - 26
(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`