JEE Main 2001 Chemistry question on Some Basic Concepts of Chemistry
An aqueous solution of 6.3 g oxalic acid dihydrate is made up to 250 mL. The volume of 0.1 N NaOH required to completely neutralise 10 mL of this solution is
A.
40 mL
B.
20 mL
C.
10 mL
D.
4 mL
Show answer and solution
Correct option: A
Solution
Molar mass of oxalic acid dihydrate (H₂C₂O₄·2H₂O) = 126 g/mol. Equivalents in 6.3 g = 6.3/126 × 2 = 0.1 eq (n-factor = 2 since diprotic acid). Normality of solution = 0.1 eq / 0.250 L = 0.4 N. Using N₁V₁ = N₂V₂: 0.4 × 10 = 0.1 × V₂, giving V₂ = 40 mL.
[2001]
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