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MMLU / Which would be the easiest way to burn an iron nail?

Problem

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question

Which would be the easiest way to burn an iron nail?

choices

  1. Hold an iron nail with crucible tongs, and heat strongly in the flame of a Bunsen burner.
  2. Use the method in (A), but use an oxyacetylene torch to reach a higher temperature.
  3. Grind the nail into very small, dust-sized particles, and spray them into a flame
  4. Dissolve the nail in acid to make the oxide.

subject

high_school_chemistry

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Source and history

Official source

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