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【Daily Question】Chemical Production Management 2020.3.30

2020-03-30View Original

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Fill-in-the-blank: In the leaching method for extracting gold or silver from gold and silver ores, the leaching agent solution used is ( ). A. Concentrated nitric acid B. Sodium cyanide C. Aqua regia D. Nitric acid + perchloric acid Answer: B. Sodium cyanide

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