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What is a disadvantage of using 70% isopropyl alcohol?

  1. It is ineffective against most bacteria

  2. It burns skin and can stain fabric

  3. It is corrosive to metals

  4. It is safe to use on all surfaces

The correct answer is: It burns skin and can stain fabric

Using 70% isopropyl alcohol has certain properties that can indeed cause skin irritation and potential damage to fabrics. One of the primary reasons it is used in disinfection is because of its high effectiveness in killing a broad range of bacteria and viruses. However, the alcohol content can be harsh, especially on sensitive skin, leading to burns or rashes when used without proper care. Additionally, its ability to penetrate fabric can result in staining or degradation of certain materials. Therefore, while it is a powerful disinfectant, it does have drawbacks when it comes to safety for direct skin contact and compatibility with all types of surfaces, particularly sensitive ones. This makes option B a valid concern in practical applications of isopropyl alcohol.