Question

What is the oxidation number of $Br$ in $KBr{O}_4$ ?

• A. + 6
• B. + 7
• C. + 5
• D. + 8

Answer 1

Answer: (B)

Let the oxidation no. of Br be x.
In KBrO₄, + 1 + x + 4 (-2) = 0, - 7 + x = 0, x = + 7