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Q: Behaviour of indicator is explained by ___________ theory.
  • A. Chromospheres
  • B. Ionic
  • C. Colour
  • D. Resonance
Correct Answer: Option B - The behaviour of indicator explained by the ionic theory, which states that the colour change of an indicator is due to its ionization. The unionized form of the indicator has a different colour than its ionized form, and this change occurs as the pH of the solution affects the ionization state of the indicator.
B. The behaviour of indicator explained by the ionic theory, which states that the colour change of an indicator is due to its ionization. The unionized form of the indicator has a different colour than its ionized form, and this change occurs as the pH of the solution affects the ionization state of the indicator.

Explanations:

The behaviour of indicator explained by the ionic theory, which states that the colour change of an indicator is due to its ionization. The unionized form of the indicator has a different colour than its ionized form, and this change occurs as the pH of the solution affects the ionization state of the indicator.