+91-8076753736 support@wiredfaculty.com

Sponsor Area

The D-And-f-Block Elements

Question

Wired Faculty App

What is meant by disproportionation of an oxidation state? Give an example.

Solution

A reaction in which the same species is simultaneously oxidised as well as reduced is called disproportionation reaction.
When a particular oxidation state becomes less stable relative to other oxidation states, one lower, one higher it is said to undergo disproportionation. For example, manganese (VI) becomes unstable relative to manganese(Vll) and manganese(IV) in acidic solution.
3Mn^VI O₄^2– + 4H⁺ → 2Mn^VIII O₄^– + Mn^IV O₂ + 2H₂O

Some More Questions From The d-And-f-Block Elements Chapter

In the series Sc (Z = 21) to Zn(Z = 30), the enthalpy of atomisation of zinc is the lowest i.e., 26, kJ mol. Why?

The E° (M²⁺/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this?

How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?

Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

Which is a stronger reducing agent Cr²⁺ or Fe²⁺ and why?

Explain why Cu⁺ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d¹⁰ 4s¹, yet it is considered transition element. Why?

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation