The GATE Grind

GATE 2024 CE (CE2) – Question 26

Water and Waste Water Quality and Treatment · Sludge treatment and disposal, reuse of treated sewage · 1 mark · Multiple choice

Which one of the following products is NOT obtained in anaerobic decomposition of glucose?

  1. CO$_2$
  2. CH$_4$
  3. H$_2$S
  4. H$_2$O

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Correct answer: (C) H$_2$S

Explanation

Glucose, C₆H₁₂O₆, contains only carbon, hydrogen and oxygen. In anaerobic decomposition it gives methane and carbon dioxide, with some water formed in intermediate reactions. Hydrogen sulphide needs sulphur (from sulphate or sulphur-bearing compounds), which glucose does not contain, so it is not a product.