The breath test conducted by police to check drunken driver

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The breath test conducted by police to check drunken driver has which one of the following on the filter paper?

[66th BPSC 2020]

Potassim dichromate-sulfuric acid

Potassium permanganate-sulfuric acid

Silica gel coated with silver nitrate

Turmeric

None of the above/More than one of the above