A 'breath test' used by traffic police to check drunken driving uses ____?
- A. Turmeric on filter paper
- B. Silica gel coated with silver nitrate
- C. potassium permanganate-sulphuric acid
- D. Potassium dichromatic-sulphuric acid
Explanation
A breathalyser uses acidified potassium dichromate, which changes colour when ethanol in exhaled air is oxidised. The option says dichromatic, but it clearly intends potassium dichromate.
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