Question
  1. $\text{MnO}_4^{2-}$ undergoes disproportionation reaction in acidic medium but does not, give reason.
  2. Give one example each of the following redox reaction:
  1. Combination reaction.
  2. Decomposition reaction.
  3. Metal displacement reaction.

Answer

  1. In $\text{MnO}_4^{2-}$ Mn is in +6 oxidation state, it can increase to +7 and decrease to +4 therefore, undergoes disproportionation reaction oxidation as well reduction simultaneously, in $\text{MnO}_4^-$ Mn is in +7. highest oxidation state, can undergo reduction only.
  2.  
  1. Combination reaction:
$\text{S}+\text{O}\xrightarrow{ \ \ \ \ \ }\text{SO}_2\\ 0\ \ \ \ \ \ 0\ \ \ \ +4,-2$
  1. Decomposition reaction:
$2\text{H}_2\text{O}_2\xrightarrow{ \ \ \ }2\text{H}_2\text{O}+\text{O}_2\\ +1-1 \ \ \ \ -2$
  1. Metal displacement reaction:
$\text{Mg}\text{(s)}+\text{CuSO}_4\text{(aq)}\xrightarrow{ \ \ \ \ \ \ }\text{MgSO}_4\text{(aq)}+\text{Cu}\\ \ 0 \ \ \ \ \ \ \ \ \ \ \ +2\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ +2\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ 0 $

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

Similar questions

What sorts of informations can you draw from the following reaction?
$(CN)_2(g) + 2OH^-(aq) \rightarrow CN^-(aq) + CNO^-(aq) + H_2O(l)$
A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. Calculate the partial pressure of dihydrogen.
i. A beam of helium atoms move with a velocity of $2.0 \times 10^3 \mathrm{~ms}^{-1}$. Find the wavelength of the particle constituting the beam, ( $\mathrm{h}=6.626 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ ).
ii. An electron is moving with a kinetic energy of $2.275 \times 10^{-25}$ J. Calculate its de-Broglie wavelength. (Mass of electron $\left.=9.1 \times 10^{-31} \mathrm{~kg}, \mathrm{~h}=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}\right)$
The energy of $\sigma 2 \mathrm{p}_{\mathrm{z}}$ molecular orbital is greater than $2 \mathrm{p}_{\mathrm{x}}$ and $2 \mathrm{p}_{\mathrm{y}}$ molecular orbitals in nitrogen molecule. Write the complete sequence of energy levels in the increasing order of energy in the molecule. Compare the relative stability and the magnetic behaviour of the following species:
$\mathrm{N}_2, \mathrm{~N}^{+}{ }_2, \mathrm{~N}_2^{-}, \mathrm{N}^{2+}{ }_2$
Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.
"For classification of elements atomic number is more appropriate in comparison to atomic mass." Comment.
The ionization constant of chloroacetic acid is $1.35 \times 10^{–3}$. What will be the pH of $0.1M$ acid and its $0.1M$ sodium salt solution?
Give the laws for IUPAC nomenclature of organic compounds have multiple groups and give examples.
Write chemical equations for combustion reaction of the following hydrocarbons:
  1. Butane.
  2. Pentene.
  3. Hexyne.
  4. Toluene.
Explain the effect of pressure, temperature, addition of catalyst and inert gas on the equilibrium of reversible reaction.