Question

Give reasons:
1)A gas fills completely the vessel in which it is kept
2)Steam causes more burns than boiling water
3) We are able to sip hot tea or milk faster from a saucer rather than a cup
4)Temperature remains constant at melting point
5) Helium, neon and argon have a zero valency
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Answer 1

1. Because it has large intermollecular space.

2. Due to latent heat of vaporisation.

3. Because it increases the surface area due to which evaporation is faster.

4. ---

5. They have full amount of electrons in their outer shell so the will not gain or lose electrons. Therefore they have zero valency.

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