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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 pH paper yellowish-orange. Which of the following would change the colour of this 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 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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