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AIPMT PRELIMS 2010 Chemistry Molarity and Concentration MCQ Question

Type: MCQ-numerical-Medium-Class 12

25.3 g of sodium carbonate, Na₂CO₃ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na⁺ and carbonate ions, CO₃²⁻ are respectively (Molar mass of Na₂CO₃ = 106 g mol⁻¹)

A

0.477 M and 0.477 M

B

0.955 M and 1.910 M

C

1.910 M and 0.955 M

D

1.90 M and 1.910 M

Correct Answer

Option C

Detailed Explanation

Molarity of Na₂CO₃ is calculated as 0.955 M. Since Na₂CO₃ dissociates into 2 Na⁺ and 1 CO₃²⁻, the concentration of Na⁺ is 2 × 0.955 M = 1.910 M and CO₃²⁻ is 0.955 M.

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