At 298 K, the molar conductivity of x %(w/w) MX solution (aqueous) is 123.5 S cm² mol⁻¹. The conductance of same solution is 1.9 × 10⁻³ S. The value of x is ____ × 10⁻².
(Given : cell constant =1.3 cm⁻¹; molar mass of MX is 75 g mol⁻¹, density of aqueous solution of MX at 298 K is 1.0 g mL⁻¹)
(Given : cell constant =1.3 cm⁻¹; molar mass of MX is 75 g mol⁻¹, density of aqueous solution of MX at 298 K is 1.0 g mL⁻¹)
Answer: 15
Solution
The conductivity is . From the molarity is . One litre of solution then contains of MX, and with density that litre weighs . The mass percentage is , so the value of x is .
JEE Main · 2026 · 05 Apr 2026 · Shift 2 · Integer answer