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Q29 (CDS-I/2026) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Consider the following statements regarding bases and alkalis: 1. All bases dissolve in water. 2. Bases which are soluble in water are called alkalis. 3. An alkali is soapy to touch, bitter and corrosive. 4. Addition of water to an alkali generates heat. Which of the statements given above are correct?

Result
Your answer: —  Â·  Correct: B

Explanation

Statement 1 is incorrect because not all bases dissolve in water. While all alkalis are bases, all bases are not alkalis. For example, ferric hydroxide and cupric oxide are bases but are insoluble in water.

  • Statement 2 is correct: An alkali is specifically defined as a base that is soluble in water. Common examples include Sodium Hydroxide (NaOH) and Potassium Hydroxide (KOH).
  • Statement 3 is correct: Alkalis are characterized by a bitter taste, a soapy or slippery feel to the touch, and they are corrosive in nature.
  • Statement 4 is correct: The process of dissolving a concentrated base or alkali in water is a highly exothermic reaction, which generates a significant amount of heat.

Since statements 2, 3, and 4 are correct, the right option is B.

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SIMILAR QUESTIONS

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