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Question

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

A
4
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B
3
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C
2
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D
1
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Solution

The correct option is B 3
Let the oxidation state of Au be x, Cl has an oxidation state of 1 and the complex ion has a 1 charge as well:
x+4(1)=1
x=+3
Oxidation state of Au in [AuCl4] is +3

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