Question

How do neutral, acidic and basic salt solutions respond to litmus test?

• A. Neutral salt $\to$ No change in the colour of litmus
  Acidic salt $\to$ Turns blue litmus to red
  Basic salt $\to$ Turns red litmus to blue
• B. Neutral salt $\to$ No change in the colour of litmus
  Acidic salt $\to$ Turns red litmus to blue
  Basic salt $\to$ Turns blue litmus to red
• C. Neutral salt $\to$ Turns blue litmus to red
  Acidic salt $\to$ No change in the colour of litmus
  Basic salt $\to$ Turns red litmus to blue
• D. None of these

Answer 1

The correct option is A Neutral salt $\to$ No change in the colour of litmus

Acidic salt $\to$ Turns blue litmus to red
Basic salt $\to$ Turns red litmus to blue

When a red litmus paper is immersed in a base or alkaline solution, the red litmus paper turns blue indicating the given solution as alkaline/base. Bases are ions that break up to form $O{H}^{-}$ (hydroxide) ions in water. The greater the concentration of $O{H}^{-}$ ions, the stronger is the base.

For example, Sodium Hydroxide, Ammonia Solution.

Blue litmus paper is used to test an acid. When a blue litmus paper immersed in an acid, the litmus paper turns red from blue indicating acid. Acids are ions that break to $H^{+}$ in water. The greater the number of $H^{+}$ ions, the stronger is the acid.

For example, hydrochloric acid, Sulfuric Acid, Carbonic acid.

No change in the colour of litmus means neutral or pH $=7$.