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A ‘breath test’ used by traffic police to check drunken driving uses ____?

/ Everyday Science Mcqs / By
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