what is the reason the first jar of H2 collected during its preparation is discarded
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Since hydrogen gas is almost insoluble in water, it can be collected by dislodging water with an instrument that is upside down.
The reason why hydrogen got discarded:
- When hydrogen and air are combined, it explodes violently. Since hydrogen is explosive when mixed with air, it burns with an explosion close to the gas jar's opening but goes out within since burning calls for oxygen, which isn't present there.
- Water is displaced downward to gather H2 since it is less dense than water. As a result, it emerges from the water's surface. It does not dissolve in water because it is insoluble in it.
- Even though hydrogen is lighter than air, displacement of air is not conceivable in this situation (14.5 times than air). The air and hydrogen mixture used in this approach is explosive, making it risky.
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