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Acids, Bases and Salts — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7ScienceAcids, Bases and Salts1 Mark
MCQ
Which solution is a conjugate acid$/$base pair with differing spectral absorbencies?
  • ✓
    Chemical $pH$ indicator
  • B
    Acid$/$ base buffer
  • C
    Hypotonic solution
  • D
    Supersaturated solution
✓

Answer

Correct option: A.
Chemical $pH$ indicator
Chemical $pH$ indicator is a conjugate acid$/$base pair with differing spectral absorbencies.
It is used to indicate the endpoint of the titration.
For example, phenolphthalein is colourless in acid solution and pink in colour in alkaline solution.
Also, litmus is red in acid solution and blue in alkaline solution.

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