FAA AMT Airframe Test 2026 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 1030

When air samples contain carbon monoxide, portable carbon monoxide detectors containing yellow silica gel will turn which color?

Blue

Red

Green

When air samples contain carbon monoxide, portable carbon monoxide detectors will turn green when exposed to the yellow silica gel. This is because yellow silica gel contains a chemical called cobalt chloride which reacts with carbon monoxide to produce a green color.

Option A, blue, is incorrect because there is no connection between carbon monoxide and the color blue. Option B, red, is incorrect because red is not a common color associated with cobalt chloride or carbon monoxide. Option D, black, is incorrect because there is no evidence to suggest that carbon monoxide would turn the yellow silica gel black.

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Black

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