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Acids, Bases and Salts — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryAcids, Bases and Salts1 Mark
MCQ
How can you determine the pH of a substance using a universal indicator?
  • A
    By counting the number of hydrogen ions directly under a microscope.
  • ✓
    By adding a piece of the indicator to the substance and observing the colour change.
  • C
    By freezing the substance and measuring its melting point.
  • D
    By evaporating the substance to see the residue colour.
✓

Answer

Correct option: B.
By adding a piece of the indicator to the substance and observing the colour change.
(b) By adding a piece of the indicator to the substance and observing the colour change.
Explanation : A universal indicator changes colour according to the pH level of the substance it comes into contact with. By adding a piece of universal indicator paper to the substance, or adding a few drops of universal indicator solution, you can observe the colour change and compare it to a pH scale to determine the acidity, neutrality, or alkalinity of the substance.

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