Give reasons:
We can easily move our hands in air but to do the same through a solid block of wood, we need a karate expert.

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Solution

The particles of the air have large spaces between them and weak intermolecular spaces so it is easy to move our hands in the air.
A solid block of wood has no spaces between its particles and strong intermolecular spaces so it is not possible for us to move our hand through it.
Therefore, a karate expert with skill can move his hands through a solid block of wood.

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Give reasons:We can easily move our hands in air but to do the same through a solid block of wood, we need a karate expert.

Give reasons:
We can easily move our hands in air but to do the same through a solid block of wood, we need a karate expert.