A ‘breath test’ used by traffic police to check drunken driving uses?
- Tumeric on filter paper
- Silica gel coated with saliva nitrate
- Potassium permanganate-sulphuric acid
-
Potassium dichromatic-sulphuric acid
The correct answer is: D
Explanation
The earliest developed breathalyzer was based on reaction of alcohol if 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 acidic medium.
There is an explanation video available .