A 'breath test' used by traffic police to check d...
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
Correct answer is D
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.
Which of the following arrangements shows increasing order of reactivity of the halogens?...
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