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Chemistry Medium FPSC PPSC NTS Uploaded: 05 Aug 2026

Which indicator changes through a full colour range across the pH scale?

  • A Universal indicator
  • B Litmus
  • C Phenolphthalein
  • D Methyl orange
Correct Answer: Option A — Universal indicator
Explanation:
Universal indicator is a mixture of several indicators that changes colour across the full pH range from red in strong acids through green at neutral to purple in strong alkalis.
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