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  4. What is the oxidation number of gold in the complex [AuCl4]1- ?

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Q. What is the oxidation number of gold in the complex $[AuCl_4]^{1-}$ ?

MHT CETMHT CET 2018Redox Reactions

Solution:

Let $x$ be the oxidation number of gold $(Au)$ in the complex $\left[ AuCl _{4}\right]^{-1}$

$\therefore x+4(-1)=-1$

$\Rightarrow x=-1+4$

$\Rightarrow x=+3$

Hence, the oxidation number of gold is +3