When an oxide of manganese $(A)$ is fused with $KOH$ in the presence of an oxidising agent and dissolved in water,it gives a dark green solution of compound $(B)$. Compound $(B)$ disproportionates in neutral or acidic solution to give purple compound $(C)$. An alkaline solution of compound $(C)$ oxidises potassium iodide solution to a compound $(D)$ and compound $(A)$ is also formed. Identify compounds $A$ to $D$ and also explain the reactions involved.
(A-D)
$1. \text{Fusion reaction: } 2 MnO_{2} + 4 KOH + O_{2} \rightarrow 2 K_{2}MnO_{4} + 2 H_{2}O$
$2. \text{Disproportionation of } (B) \text{ in acidic medium: } 3 MnO_{4}^{2-} + 4 H^{+}$ $\rightarrow 2 MnO_{4}^{-} + MnO_{2} + 2 H_{2}O$
$3. \text{Oxidation of } KI \text{ by } (C) \text{ in alkaline medium: } 2 MnO_{4}^{-} + H_{2}O + I^{-}$ $\rightarrow 2 MnO_{2} + 2 OH^{-} + IO_{3}^{-}$
| $A$: $MnO_{2}$ | $B$: $K_{2}MnO_{4}$ |
| $C$: $KMnO_{4}$ | $D$: $KIO_{3}$ |
$1. \text{Fusion reaction: } 2 MnO_{2} + 4 KOH + O_{2} \rightarrow 2 K_{2}MnO_{4} + 2 H_{2}O$
$2. \text{Disproportionation of } (B) \text{ in acidic medium: } 3 MnO_{4}^{2-} + 4 H^{+}$ $\rightarrow 2 MnO_{4}^{-} + MnO_{2} + 2 H_{2}O$
$3. \text{Oxidation of } KI \text{ by } (C) \text{ in alkaline medium: } 2 MnO_{4}^{-} + H_{2}O + I^{-}$ $\rightarrow 2 MnO_{2} + 2 OH^{-} + IO_{3}^{-}$
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Similar Questions
Which from the following is the general formula of the compound obtained when lanthanoid $(Ln)$ reacts with carbon at elevated temperature?
Which of the following compounds is used as the starting material for the preparation of potassium dichromate?
Easy
View SolutionCorrect statements from the following are:
$A$. Potassium dichromate is an oxidising agent and it oxidises $FeSO_4$ to $Fe_2(SO_4)_3$ in acidic medium.
$B$. Sodium dichromate can be used as primary standard in volumetric estimation.
$C$. $CrO_4^{2-}$ and $Cr_2O_7^{2-}$ are interconvertible in aqueous solution by varying the $pH$ of the solution.
$D$. $Cr-O-Cr$ bond angle in $Cr_2O_7^{2-}$ is $126^\circ$.
Choose the correct answer from the options given below:
$A$. Potassium dichromate is an oxidising agent and it oxidises $FeSO_4$ to $Fe_2(SO_4)_3$ in acidic medium.
$B$. Sodium dichromate can be used as primary standard in volumetric estimation.
$C$. $CrO_4^{2-}$ and $Cr_2O_7^{2-}$ are interconvertible in aqueous solution by varying the $pH$ of the solution.
$D$. $Cr-O-Cr$ bond angle in $Cr_2O_7^{2-}$ is $126^\circ$.
Choose the correct answer from the options given below:
The highest oxidation state of $Mn$ is exhibited in $Mn_2O_7$. The correct statements about $Mn_2O_7$ are:
$(A)$ $Mn$ is tetrahedrally surrounded by oxygen atoms.
$(B)$ $Mn$ is octahedrally surrounded by oxygen atoms.
$(C)$ Contains $Mn-O-Mn$ bridge.
$(D)$ Contains $Mn-Mn$ bond.
Choose the correct answer from the options given below:
$(A)$ $Mn$ is tetrahedrally surrounded by oxygen atoms.
$(B)$ $Mn$ is octahedrally surrounded by oxygen atoms.
$(C)$ Contains $Mn-O-Mn$ bridge.
$(D)$ Contains $Mn-Mn$ bond.
Choose the correct answer from the options given below:
Match Column $A$ with Column $B$:
Column $A$ Column $B$ $(1)$ Brass $(a)$ $Ni$ $(60\%)$,$Cr$ $(40\%)$ $(2)$ Bronze $(b)$ $Cu$ $(80\%)$,$Sn$ $(20\%)$ $(3)$ Cupronickel $(c)$ $Cu$ $(90\%)$,$Sn$ $(10\%)$ $(4)$ Nichrome $(d)$ $Cu$ $(70\%)$,$Zn$ $(30\%)$ $(e)$ $Cu$ $(75-85\%)$,$Ni$ $(15-25\%)$
| Column $A$ | Column $B$ |
|---|---|
| $(1)$ Brass | $(a)$ $Ni$ $(60\%)$,$Cr$ $(40\%)$ |
| $(2)$ Bronze | $(b)$ $Cu$ $(80\%)$,$Sn$ $(20\%)$ |
| $(3)$ Cupronickel | $(c)$ $Cu$ $(90\%)$,$Sn$ $(10\%)$ |
| $(4)$ Nichrome | $(d)$ $Cu$ $(70\%)$,$Zn$ $(30\%)$ |
| $(e)$ $Cu$ $(75-85\%)$,$Ni$ $(15-25\%)$ |
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