Multiple choice

The bacterial breakdown of organic matter emits ______________ gas.

  1. hydrogen selenide

  2. hydrogen sulfide

  3. hydrogen telluride

  4. hydroxylamine
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hydrogen sulfide is a colourless, very poisonous, flammable gas with the characteristic foul odour of rotten eggs at concentrations up to 100 parts per million. It often results from the bacterial breakdown of organic matter in the absence of oxygen, such as in swamps and sewers.

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