Final answer:
NH₄NO₃ (ammonium nitrate) does not produce a green colored product on thermal decomposition. The correct answer in option d).
Step-by-step explanation:
The compound that does not produce a green coloured product on thermal decomposition among the options given is d) NH₄NO₃ (ammonium nitrate). When potassium dichromate (K₂Cr₂O₇), potassium permanganate (KMnO₄), or ammonium dichromate ((NH₄)₂Cr₂O₇) decompose.
They all produce various compounds, and because of the presence of chromium (Cr) or manganese (Mn), the resulting substance can be green or purple-green in color. However, ammonium nitrate decomposes to yield nitrogen gas (N₂), water vapor, and oxygen (O₂), with no green colored product formed. The compound that does not produce a green-colored product on thermal decomposition is NH4NO3.