The oxidation number of the underlined atom in the following species is wrongly matched

The oxidation number of the underlined atom in the following species is wrongly matched

A
$H Au {Cl}_{4} is + 3$
B
${Cu}_{2} O is - 1$
C
$Cl {O_{3}}^{-} is + 5$
D
$K_{2} {Cr}_{2} O_{7} is + 6$

Solution:

$(1) {HAuCl}_{4} \Rightarrow (+ 1) + x + 4 (- 1) = 0 x = + 3$

$(2) C u_{2} O \Rightarrow 2 (+ 1) + x = 0 x = - 2$

$(3) C l {O_{3}}^{-} \Rightarrow x + 3 (- 2) = - 1 x = + 5$

$(4) K_{2} C r_{2} O_{7} \Rightarrow 2 (+ 1) + 2 x + 7 (- 2) = 0 x = + 6$

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