considered the following figure
in which of the given cases a gas is released
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hydrogen in 2
o2 in 3
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This is a lab activity. In the case second there will be a release of Hydrogen.
One needs to bring a matchstick near the beaker and we will hear the pop sound, which confirms the presence of Hydrogen.
The case 3 will produce oxygen.
If we bring a lighted matchstick there it will keep on burning as oxygen supports combustion.
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