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

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Question:A ‘breath test’ used by traffic police to check drunken driving uses:

1.turmeric on filter paper

2.silica gel coated with silver nitrate

3. potassium perma-nganate-sulphuric acid

4.potassium dichromate-sulphuric acid

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  1. A ‘breath test’ used by traffic police to check drunken driving uses:
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