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Q: The colour change is due to ionisation of the acid -base indicator is-
  • A. Ostwald theory
  • B. Chromophore theory
  • C. Quinonoid theory
  • D. Resonance theory
Correct Answer: Option A - According to Ostwald's theory, the colour change in acid-base indicators is due to the ionization of the indicators. The undissociated form of the indicator has a different colour than its dissociated form. The colour change occurs as the pH of the solution changes, affecting the ionization state of the indicator.
A. According to Ostwald's theory, the colour change in acid-base indicators is due to the ionization of the indicators. The undissociated form of the indicator has a different colour than its dissociated form. The colour change occurs as the pH of the solution changes, affecting the ionization state of the indicator.

Explanations:

According to Ostwald's theory, the colour change in acid-base indicators is due to the ionization of the indicators. The undissociated form of the indicator has a different colour than its dissociated form. The colour change occurs as the pH of the solution changes, affecting the ionization state of the indicator.