CDS 2026 (I) General Knowledge, question 29

Topic: Chemistry

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Q29

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 ?

  1. (a) 1, 2, 3 and 4
  2. (b) 2, 3 and 4 onlyCorrect answer
  3. (c) 1 and 2 only
  4. (d) 3 and 4 only

Solution.

Answer: (b) 2, 3 and 4 only

  1. Statement 1 is false because many bases, such as copper oxide, do not dissolve in water.
  2. Statement 2 is correct: bases that dissolve in water are called alkalis.
  3. Statements 3 and 4 are correct: alkalis such as sodium hydroxide feel soapy, taste bitter, are corrosive and release heat when mixed with water.