The correct option is (c).
Explanation
Acids and bases are distinguished by specific physical properties such as taste and solubility, as well as their chemical interaction with indicators.- Statement 1 is Incorrect: Acids are characterized by a sour taste (e.g., citric acid in lemons). It is bases that are bitter to taste and feel soapy to touch.
- Statement 2 is Correct: Bases that are soluble in water are specifically called alkalis (e.g., Sodium Hydroxide). All alkalis are bases, but not all bases are alkalis.
- Statement 3 is Correct: Indicators are substances that change colour when placed in acidic or basic solutions, thereby helping to identify the nature of the substance (e.g., Litmus turns red in acid and blue in base).
Key Takeaway: Acids taste sour, whereas bases taste bitter. Alkalis are a specific subset of bases that dissolve in water.