Question

The incorrect statement about acids is

• A. they give H⁺ ion in water.
• B. they are sour in taste.
• C. they turn blue litmus red.
• D. they give pink color with phenolphthalein.

Answer 1

The correct option is D

they give pink color with phenolphthalein.

The explanation for the correct option:

• Acids are chemical substances that dissolve in water to release Hydrogen ions (H⁺).
• Physical properties of acids:

1. They have a sour taste.
2. They turn blue litmus red.
3. They conduct electricity.

The explanation for the incorrect option:

• Phenolphthalein is an indicator that is used in acid-base titrations. In an acidic medium, it turns colorless while in an alkaline or basic medium, it turns pink.

Final answer: Hence, option (4) is correct. The incorrect statement about acids is that they give pink color in phenolphthalein.