Explain the solid appears in the list of pure substances

Reference no: EM13501681

A white solid, soluble in water and alcohol but not in toluene, does not melt when heated to 250°C. However, upon prolonged heating of the solid a colorless gas evolves and the amount of solid "shrinks". The solid appears in the list of pure substances. Identify it?

Reference no: EM13501681

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