Question

Which of the following is an oxidising agent? (i) LiAlH4 (ii) Alkaline KMnO4 (iii) Acidified K2Cr2O7 (iv) Both (b) and (c)​

Answer 1

Answer:

iv

Explanation:

both are strong oxidizing agent while a is mild oxidizing agent

Answer 2

The oxidizing agents among the given compounds are alkaline $\[KMn{O_4}\]$ and acidified $\[{K_2}C{r_2}{O_7}\]$. Thus, the correct option is (iv) Both (b) and (c).

Explanation:

• An oxidizing agent is a compound that has the ability to oxidise other compounds.  
• They oxidise other compounds by adding oxygen atoms or removing hydrogen atoms.  
• Both alkaline potassium permanganate ($\[KMn{O_4}\]$) and acidified potassium dichromate ($\[{K_2}C{r_2}{O_7}\]$) have the ability to add oxygen atoms to other compounds. Thus, they act as oxidizing agents.  
• On the other hand, lithium aluminium hydride ($\[LiAl{H_4}\]$) acts as a reducing agent.