Question

Which one among the following is the mild oxidizing agent?

• A. ${\text{CrO}}_{\text{2}}{\text{Cl}}_{\text{2}}$
• B. ${\text{K}}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$
• C. $KMn{O}_4$
• D. $HN{O}_3$

Answer 1

Answer: (A)

${\text{CrO}}_{\text{2}}{\text{Cl}}_{\text{2}}$ is mild oxidising agent.

In this compound $Cr$ is surrounded by less electrongative $\text{Cl}$ atom rather than oxygen so it does not produce so much positve charge on chromium in comparision to other compound containing highly electronegative $\text{O}$ atom. So, due to relativily low value of Standard Reduction potential it act as mild oxidising agent.

${\text{KMnO}}_{\text{4}}{\text{,HNO}}_{\text{3}}$ and ${\text{K}}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$ are strong oxidising agent due to high Standard Reduction potential.