Red Seal Welding Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What percentage of acetylene in the air makes it explosive?

1%-50%

2.5%-80%

Acetylene becomes explosive when it reaches a high concentration in the air. As such, we can rule out options A and D since they are below the minimum percentage required for explosiveness. Option C is also incorrect as it is above the maximum percentage. Therefore, the correct answer is B which falls within the safe range of 2.5%-80%.

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3%-90%

0.5%-75%

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