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Q. Which of the following is the most powerful oxidising agent?

The p-Block Elements - Part2

Solution:

$H_2SO_4$ is most powerful oxidising agent because sulphur is present in its highest oxidation self (oxidises others self reduces).
$\underset{\overset{2 + x (-8) = 0}{x = + 6}}{H_2SO_4} \quad \underset{\overset{+3 + x + (-6) = 0}{x = +3}}{H_3BO_3} \quad \underset{\overset{+3 + x + (-8) = 0}{x = + 5}}{H_3PO_4}$