WBCS.LIVE practice question

How many grams of a dibasic acid (molecular weight = 200) should be present in 100 ml of its aqueous solution to give exactly 0.1 (N) strength?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 1 gm
  2. 2 gm
  3. 0.5 gm
  4. 10 gm

Correct answer and explanation

Correct answer: 1 gm

Explanation: āœ… Correct Answer: A) 1 gm šŸ“š Explanation: For a dibasic acid, the Equivalent Weight is Molecular Weight / 2, which equals 100. Normality (N) is calculated as (Mass / Equivalent Weight) Ɨ (1000 / Volume in ml). Substituting the given values: 0.1 = (Mass/100) Ɨ (1000/100). Solving this equation gives the exact Mass = 1 gm.