Download App

The d- and f-Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d- and f-Block Elements3 Marks
Question
Permanganate ion $\left( MnO _4^{-}\right)$gives different reduction products at different concentration of hydrogen ions, write their equations.
✓

Answer

The products formed in the reduction reaction of permanganate ion depend on the concentration of hydrogen ion. The reactions occurring at different concentration of $H ^{+}$ are as follows:
$
\begin{aligned}
MnO_{+7}^{-}+e^{-} & \rightarrow \underset{+6}{MnO_4^{2-}} \\
MnO_4^{-}+4 H^{+}+3 e^{-} & \rightarrow \underset{+4}{MnO_2}+2 H_2 O \\
MnO_4^{-}+8 H^{+}+5 e^{-} & \rightarrow Mn^{2+}+4 H_2 O
\end{aligned}
$
Water should be oxidized by permanganate ion at $\left[ H ^{+}\right]$ $=1$ but this reaction happens very slowly but in this. The rate of reaction increases by using $Mn ^{2+}$ ion as a catalyst or by increasing the temperature.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from The d- and f-Block Elements→The d- and f-Block Elements — all question types→Chemistry STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

  1. What is the basis of formation of the spectro-chemical series?
  2. Draw the structures of geometrical isomers of the following coordination complexes:
$[Co(NH_3)_3Cl_3]$ and $ [CoCl_2(en)_2]^+.$
(en = ethylenediamine and atomic number of Co is 27).
→
  1. Write the principle of method used for the refining of germanium.
  2. Out of $PbS$ and $PbCO_3$ (ores of lead), which one is concentrated by froth floatation process preferably?
  3. What is the significance of leaching in the extraction of aluminium?
→
  1. Name the sweetening agent used in the preparation of sweets for a diabetic patient.
  2. What are antibiotics? Give an example.
  3. Give two examples of macromolecules that are chosen as drug targets.
→
Write reactions to obtain acetic acid from ethanenitrile, acetyl chloride and ethyl ethonoate.
→
Write down the difference between $SN^{1}$ and $SN^{2}$ reaction.
→
Calculate $(a)$ molality $(b)$ molarity and $(c)$ mole fraction of KI if the density of $20\%$ $($mass/mass$)$ aqueous KI is $1.202\ g\ mL^{-1}.$
→
What is the difference between multi molecular and macromolecular colloids? Give one example of each type. How are associated colloids different from these two types of colloids?
→
Explain Crystal field splitting in tetrahedral complax.
→
Why vitamin D, E and K compounds are essential for us? Describe their important sources.
→
What role does adsorption play in heterogeneous catalysis?
→