[Answer] 3. What is the characteristic smell of hydrogen sulphide gas?

Step 1 : Introduction to the question "3. What is the characteristic smell of hydrogen sulphide gas?"

...1. Ripe apples 2. Rotten eggs 3. Burnt sugar 4. Stale bread When any compound having sulphur in the form of sulphides reacts with a dilute acid, hydrogen sulphide (H2S) is formed. This forms the basis of qualitative chemical analysis to determine the presence of sulphur in compounds. Hydrogen sulphide is also produced naturally by the decay of sulphur-containing organic matter and is found in some mineral springs.

Step 2 : Answer to the question "3. What is the characteristic smell of hydrogen sulphide gas?"

Rotten eggs:

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