Question

What is the oxidation number of gold in the complex [AuCl₄]¹⁻?

Options

• +4

• +3

• +2

• +1

Answer 1

+3

Explanation:

In [AuCl₄]¹⁻ let the oxidation number of Au = x

x + 4(−1) = −1

x − 4 = −1

x = −1 + 4

x = +3