Question

hydrogen is collected over Water by downward displacement of water.(true/false)​

Answer 1

Answer:

True...

Explanation:

Hydrogen is collected by downward displacement of water as it is less denser than water. ... It is insoluble in water so it does not dissolve in water. In case of displacement with air, it is not possible even if hydrogen is lighter than air (14.5 times lighter than air).

Answer 2

Answer:

true and pure hydrogen is collected with mercury

Explanation:

hydrogen mixture with air forms a violent reaction, flammable when brought near a naked flame