Identify A to E. Pyrolusite on heating with KOH in the presence of air gives a dark green compound (A). The solution of (A) on treatment with `H_2SO_4` gives a purple coloured compound `(B)`, which gives the following reactions:
(a). KI on reaction with alkaline solution of (B) changes into a compound (C).
(b). The colour of the compound (B) disappears on treatment with the acidic solution of `FeSO_4`.
(c). With conc. `H_2SO_4` compound (B) gives (D) which can compose to yield (E) and oxygen.

The compound which gives H_2O_2 on treatment with dilute acid is

Black solid underset(Delta)overset(KOH+Air)to underset(("green"))((A))overset(H_(2)SO_(4))to underset(("purple"))((B))+(C) (i) KI on reaction with alkali solution of (B) changes into a compound (D). (ii) The colour of the compound (B) disappears on treatment with the acidic solution of FeSO_(4) (iii) With cold conc. H_(2)SO_(4) compound (B) gives (E), which being explosive decomposes to yield (F) and oxygen. ltBrgt Q. Type of hybridization in compound (D) is:

Black solid underset(Delta)overset(KOH+Air)to underset(("green"))((A))overset(H_(2)SO_(4))to underset(("purple"))((B))+(C) (i) KI on reaction with alkali solution of (B) changes into a compound (D). (ii) The colour of the compound (B) disappears on treatment with the acidic solution of FeSO_(4) (iii) With cold conc. H_(2)SO_(4) compound (B) gives (E), which being explosive decomposes to yield (F) and oxygen. ltBrgt Q. Which of the following options is correct?

Black solid underset(Delta)overset(KOH+Air)to underset(("green"))((A))overset(H_(2)SO_(4))to underset(("purple"))((B))+(C) (i) KI on reaction with alkali solution of (B) changes into a compound (D). (ii) The colour of the compound (B) disappears on treatment with the acidic solution of FeSO_(4) (iii) With cold conc. H_(2)SO_(4) compound (B) gives (E), which being explosive decomposes to yield (F) and oxygen. ltBrgt Q. Colour of the solution obtained, when ferrous sulphate reacts with acidic solution of (B):

Which of the following compound gives red colour with iodine solution ?

(i) A powdered substance (A) on treatment with fusion mixture gives a green coloured compound (B). (ii) The solution of (B) in boiling water on acidification with dilute H_(2)SO_(4) gives a pink coloured compound (C ) . The oxidation state of central metal ions of (A), (B) and (C ) compounds are respectively :

Identify (A) to ( C) . (a) An inorganic iodide (A) on heating with a solution of KOH gives a gas (B) and the solution of a compound ( C) .

(a). A powdered substance (A) on treatment with fusion mixture gives a green coloured compound (B). (b). The solution of (B) The solution of (B) in boiling water on acidification with dilute H_2SO_4 gives a pink coloured compound (C).

(a). An ore (A) on roasting with sodium carbonate and lime in the presence of air gives two compounds (B) and (C). (b). The solution of (B) in conc. HCl on treatment with potassiu ferroyanide gives a blue colour or precipitate of compound (D).

When MnO_(2) , is fused with KOH in the presence of KNO_(3) as an oxidizing agent, it gives a dark green compound (A). Compound (A) disproportionates in acidic solution to give purple compound (B). An alkaline solution of compound (B) oxidises Kl to compound (C)whereas an acidified solution of compound (B) oxidises KI to (D), Identity (A), (B), (C), and (D).