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Formaldehyde gas has been used to

  • A.fumigate rooms and safety cabinets
  • B.sterilize solutions for injection
  • C.preserve cultures for long-term storage
  • D.clean instruments before autoclaving

Answer: A

As a gas it reaches surfaces throughout an enclosed space, which suited it to decontaminating rooms and cabinets, though its irritancy and carcinogenicity have narrowed its use. Vaporised hydrogen peroxide now serves much the same purpose more safely.

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