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The electrolytes usually used in the electroplating of gold and silver, respectively are:

1. [Au(CN) 2 ] – and [Ag(CN) 2 ] –
2. [Au(CN) 2 ] – and [Ag(Cl 2 ] –
3. [Au(OH) 4 ] – and [Ag(OH) 2 ] –
4. [Au(NH 3 ) 2 ] + and [Ag(CN) 2 ] –

Correct answer: [Au(CN) 2 ] – and [Ag(CN) 2 ] –

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