Question

When blue litmus was added to an unknown liquid in a test tube, it turned red. What was the liquid?
1. An acid
2. Water
3. An alkali
4. Saline

Answer 1

Correct Answer - Option 1 : An acid

The correct answer is acid.

• Acid
  • Acids are substances that have a sour taste, have one or more replaceable hydrogen atoms, and turn blue litmus and methyl orange to red.
  • Example: Hydrochloric acid, nitric acid, sulphuric acid, etc.
• Litmus:
  • It is an indicator that shows a color change in the solution as the pH of the solution changes.
  • It is used to identify whether a solution is acidic, basic, or neutral.

• Water
  • It is vital for all known forms of life, even though it provides no calories or organic nutrients
  • Its chemical formula is H₂O.
  • A Ph of pure water is 7.
• An alkali
  • Base or alkali turn red litmus to blue, methyl orange to yellow, and have a bitter taste.
  • These solutions are soapy to touch.
  • Example: Potassium Hydroxide, Magnesium Hydroxide, Sodium Hydroxide, etc.
• Saline
  • Saline or salts are the compounds obtained by the reaction of acid and base, such reactions are called neutralization reactions.
  • Example: Sodium Chloride, Potash alum, etc.