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a ‘breath test’ used by traffic police to check drunken driving uses

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Q.

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 perma-nganate-sulphuric acid

[D] potassium dichromate-sulphuric acid

Answer & Explanation
Option: [D]

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