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In a discharge tube ionization of enclosed gas is produced due to collisions between:

1. negative electrons and neutral atoms/molecules
2. photons and neutral atoms/molecules
3. neutral gas atoms/molecules
4. positive ions and neutral atoms/molecules

Correct answer: negative electrons and neutral atoms/molecules

Solution

In a discharge tube, ionization occurs when high-energy electrons collide with neutral gas atoms or molecules, transferring enough energy to eject electrons and create ions.

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