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प्रश्न
Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with oxalic acid? Write the ionic equation for the reaction.
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उत्तर
Potassium permanganate can be made by the following methods:
In the laboratory, salts of the manganese (II) ion are oxidized by oxydisulfate to form permanganates.
\[\ce{MnO^-_4 + 8H+ + 5e- -> Mn^{2+} + 4H2O] \times 2}\]
\[\begin{array}{cc}
\ce{COO-}\phantom{.....................}\\
5| \ce{-> 10CO2 + 10e-}\\
\ce{COO-}\phantom{.....................}\\
\end{array}\]
______________________________________________________
\[\ce{2MnO^-_4 + 16H+ + 5C2O^{2-}_4 -> 2Mn^{2+} + 10CO2 + 8H2O}\]
संबंधित प्रश्न
Complete the following equations: Cr2O72- + 14H+ + 6I →
When chromite ore FeCr2O4 is fused with NaOH in presence of air, a yellow-coloured compound (A) is obtained, which on acidification with dilute sulphuric acid gives a compound (B). Compound (B) on reaction with KCl forms an orange coloured crystalline compound (C).
(i) Write the formulae of the compounds (A), (B) and C.
(ii) Write one use of compound (C).
Complete the following equation : MnO4- + 8H+ + 5e- →
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Cr2O72- + 3Sn2+ + 14H+ →
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Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with iron (II) ions? Write the ionic equation for the reaction.
Complete the following equations:
`2MnO_4^(-)+16H^++5S^(2-)rarr`
Complete the following equation :
Account for the following :
Manganese shows maximum number of oxidation states in 3d series.
Generally transition elements and their salts are coloured due to the presence of unpaired electrons in metal ions. Which of the following compounds are coloured?
(i) \[\ce{KMnO4}\]
(ii) \[\ce{Ce(SO4)2}\]
(iii) \[\ce{TiCl}\]
(iv) \[\ce{Cu2 Cl2}\]
When \[\ce{Cu^2+}\] ion is treated with \[\ce{KI}\], a white precipitate is formed. Explain the reaction with the help of chemical equation.
When orange solution containing \[\ce{Cr2O^{2-}7}\] ion is treated with an alkali, a yellow solution is formed and when \[\ce{H^+}\] ions are added to yellow solution, an orange solution is obtained. Explain why does this happen?
Why \[\ce{HCl}\] should not be used for potassium permanganate titrations?
The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in a basic medium is ______.
Potassium permanganate on heating at 513 K gives a product which is ______.
In the two tetrahedral structures of dichromate ion, ______.
