The most powerful oxidizing agent a number of the following is:
A. ${K_2}C{r_2}{O_7}$
B. $Mn{O_2}$
C. $KMn{O_4}$
D. $C{l_2}$

Hint:In chemistry, an oxidizing agent, or oxidizing agent is a substance that has the ability to oxidize other materials — in different phrases to accept their electrons. Common oxidizing sellers are oxygen, hydrogen peroxide and the halogens.

Complete step by step answer:
As we know that,
 ${E^ \circ }_{C{r_2}^{3 + }/Cr} = - 0.74V;{E^ \circ }_{Cl/C{l^ - }} = 1.36V$
 ${E^ \circ }_{C{r_2}{O_7}^{2 - }/C{r^{2 + }}} = 1.33V;{E^ \circ }_{Mn{O_4}^ - /M{n^{2 + }}} = 1.51V$
As we know, the highest reduction potential is the strong oxidizing agent.
From the above data we find that $KMn{O_4}$ has the highest reduction potential so is the strongest oxidizing agent.
Potassium permanganate, $KMn{O_4}$ , is a effective oxidizing agent, and has many uses in organic chemistry
Potassium permanganate seems to be a purplish coloured crystalline strong. Noncombustible however quickens the burning of flammable material. If the combustible material is finely divided the aggregate can be explosive. Contact with liquid combustible substances may additionally bring about spontaneous ignition. Touch with sulfuric acid may cause fire or explosion. Used to make different chemical substances and as a disinfectant.
Permanganic acid $(KMn{O_4})$ potassium salt. A notably oxidative, water-soluble compound with red crystals, and a candy taste.

So, the correct answer is Option C.

Note: Permanganic acid $(HMn{O_4})$ potassium salt. An incredibly oxidative, water-soluble compound with crimson crystals, and a sweet taste. It results in spontaneous ignition. Reaction with sulfuric acid may cause an explosion. Used to make other chemicals and as a disinfectant.