HiSET Science Test Prep

Category - HiSET Science Practice Test Questions

Which of the following substances will turn blue litmus paper red?
  1. HCl
  2. H2O
  3. NaCl
  4. NaOH
  5. NH3
Explanation
Answer: HCl

Acids turn blue litmus paper red. Thus, HCl will change the color of blue litmus paper.
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