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Q: 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 permanganate-sulphuric acid
  • 4
    Potassium dichromatic-sulphuric acid
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Answer : 4. "Potassium dichromatic-sulphuric acid"
Explanation :

Answer: D) Potassium dichromatic-sulphuric acid Explanation:

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