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(i) A powdered substance (A) on treatmen...

`(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 ).
`(iii)` The aqueous solution of (A) on treatment with NaOH and `Br_(2)-` water gives a compound (D).
`(iv)` A solution of (D) in conc. `HNO_(3)` on treatment with lead peroxide at boiling temperature produced a compound `(E)` which was of the same colour at that of `(C )`.
`(v)` A solutionof ( A) on treatment with a solution of barium chloride gas a white precipitate of compound (F) which was insoluble in conc. `HNO_(3)` and conc. HCl.
Which of the following is true for compound (C ).

A

It oxidises ammonia to nitrogen dioxide in neutral medium.

B

it's pink colour is due to d-d transition.

C

it can be oxidised by ozone

D

it is obtained by alkaline fusion of pyrolusite followed by electrolytic oxidation.

Text Solution

Verified by Experts

The correct Answer is:
D
(A) `2MnO_(4)^(-)+2NH_(3) to 2MnO_(2)+N_(2)+2OH^(-)+2H_(2)O`
it is due to charge transfer from `O_(2-)` to empty d-orbital of `Mn(VII)`.
`MnOO_(4)^(-)` is in highest oxidation state i.e+VII and thus can not ve oxidised further.
`MnO_(2)+OH to MnO_(2)^(2-)undersetto([e^(-)])MnO_(4)^(-)`
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(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 ) . (iii) The aqueous solution of (A) on treatment with NaOH and Br_(2)- water gives a compound (D). (iv) A solution of (D) in conc. HNO_(3) on treatment with lead peroxide at boiling temperature produced a compound (E) which was of the same coloure at that of (C). (v) A solution of (A) on treatment with a solution of barium chloride gave a white precipitate of compound (F) Which was insoluble in conc. HNO_(3) and conc. HCl. Which of the following is true for compound (C ).

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(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 ) . (iii) The aqueous solution of (A) on treatment with NaOH and Br_(2)- water gives a compound (D). (iv) A solution of (D) in conc. HNO_(3) on treatment with lead peroxide at boiling temperature produced a compound (E) which was of the same coloure at that of (C). (v) A solution of (A) on treatment with a solution of barium chloride gave a white precipitate of compound (F) Which was insoluble in conc. HNO_(3) and conc. HCl. The oxidation state of central metal ions of (A), (B) and (C ) compounds are respectively :

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(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).