A 'breath test' used by traffic police to check drunken driving uses?
A. Tumeric on filter paper B. Silica gel coated with saliva nitrate C. Potassium permanganate-sulphuric acid D. Potassium dichromatic-sulphuric acid
Correct Answer: D
Explanation
The earliest developed breathalyzer was based on the reaction of alcohol is present in the exhaled air with a cocktail of chemicals containing sulfuric acid, potassium dichromate, silver nitrate, and water. Silver nitrate catalyzes the reaction between alcohol and potassium dichromate in an acidic medium.
