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Acids, Bases and Salts — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7ScienceAcids, Bases and Salts1 Mark
MCQ
Consider The Following Statements, Choose The Correct One:
  • A
    Both acids and bases change colour of all indicators.
  • B
    If an indicator gives a colour change with an acid it does not give a change with a base.
  • C
    If an indicator changes colour with a base but does not change colour with an acid.
  • ✓
    Change of colour in an acid and a base depends on the type of indicators.
✓

Answer

Correct option: D.
Change of colour in an acid and a base depends on the type of indicators.
As an example, to understand: methyl orange and phenolphthalein used as indicator. In acidic solution, methyl orange gives red colour but in basic solution it gives yellow colour. In acidic solution, phenolphthalein is colourless but in basic it gives pink colour. Thus, the change of colour in acid and a base depends on the type of indicators.

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