Question

Which gas is evolved during some chemical reaction using a conical flask

Answer 1

Hydrogen gas is evolved and it can be observed by bring the burning candle near to tge flask it will make a pop sound and burn.



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Answer 2

• Yes, but we cannot observe the conservation of mass.
• When the experiment is conducted in a closed container where there is no scope for oxygen to escape,we can observe the conservation of mass. But in this condition this experiment is not possible.