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Acids, Bases and Salts — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts1 Mark
MCQ
A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the $\ce{pH}$ paper yellowish $-$ orange. Which of the following would change the colour of this $\ce{pH}$ paper to greenish $-$ blue?
  • A
    Lemon juice.
  • B
    Vinegar.
  • C
    Common salt.
  • ✓
    An antacid.
✓

Answer

Correct option: D.
An antacid.
Since soil mixture is turning the $\ce{pH}$ paper yellowish $-$ orange, hence soil is acidic in nature.
So, adding an antacid would change the colour to greenish $-$ blue.

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