Multiple choice

Which of the following salts of sodium is used in gold extraction?

  1. Sodium thiosulphate

  2. Sodium chloride

  3. Sodium bismuthate

  4. Sodium thioplatinate

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A Correct answer
Explanation

Sodium thiosulphate forms strong complex with gold ions and it is non-toxic. So, some very refractory substances in gold ore can be leached.