Subject Category > General Knowledge
Q. A ‘breath test’ used by traffic police to check drunken driving uses ____?
A) Silica gel coated with silver nitrate
B) Turmeric on filter paper
C) Potassium dichromatic-sulphuric acid
D) potassium permanganate-sulphuric acid
✔ Potassium dichromatic-sulphuric acid
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