What is the oxidation number of gold in the complex $[A u C l_{4}]^{1 -}$ ?

+ 4

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+ 3

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+ 2

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+ 1

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Solution

The correct option is B $+ 3$
Oxidation state of chlorine $C l$ is $- 1$ .
Let the oxidation number of gold $A u$ be $x$ .
$∴$ $x + 4 \times (- 1) = - 1$
$⟹ x = + 3$
Thus oxidation number of gold is $+ 3$ .
Correct answer is option B.

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