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Acids, Bases and Salts — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7ScienceAcids, Bases and Salts1 Mark
MCQ
Hydrogen chloride gas turns the blue litmus paper:
  • A
    Green
  • B
    Red
  • C
    Black
  • ✓
    No change in colour
✓

Answer

Correct option: D.
No change in colour

The colour of blue litmus paper changes only in the presence of ions like hydrogen $(H^+)$ or hydronium $(H_3​O^+)$ ions. HCl can produce these ions only in an aqueous solution. Hence dry $HCl$ gas does not change the colour of dry litmus paper.

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