Question

Consider the following substances : (i) Acidified K$_2$Cr$_2$O$_7$
(ii) Alkaline KMnO$_4$
(iii) Oxygen
(iv) Hydrogen
Out of these, the commonly used oxidising agents are :

• A. (i) and (ii) only
• B. (ii) and (iii) only
• C. (i), (ii) and (iii)
• D. (i), (ii) and (iv)

Hint:

Remember: Substances that gain electrons and help other substances lose electrons are called oxidising agents. Hydrogen is a reducing agent.

Answer 1

The Correct Option is C

Acidified potassium dichromate (K$_2$Cr$_2$O$_7$) and alkaline potassium permanganate (KMnO$_4$) are strong oxidising agents commonly used in redox reactions to oxidise various compounds. Oxygen is also a powerful oxidising agent because it readily accepts electrons and supports combustion and oxidation processes. Hydrogen, on the other hand, acts as a reducing agent since it donates electrons. Therefore, (i), (ii) and (iii) are the correct choices.