Exams › JEE Main › Chemistry

For strong electrolyte, Λm increases slowly with dilution and can be represented by the equation Λm = Λm° − A c^1/2 Molar conductivity values of the solutions of strong electrolyte AB at 18°C are given below: c [mol L^-1] : 0.04, 0.09, 0.16, 0.25 Λm [S cm^2 mol^-1] : 96.1, 95.7, 95.3, 94.9 The value of constant A based on the above data [in S cm^2 mol^-1/(mol/L)^1/2] unit is ____.

1. 1
2. 2
3. 4
4. 5

Correct answer: 4

Solution

The correct option is 4 because the decrease in molar conductivity with increasing concentration can be modeled by the equation provided, where the constant A represents the rate of change of conductivity with respect to the square root of concentration. By analyzing the given data, we can determine that the value of A that best fits the observed decrease in conductivity is 4.

Related JEE Main Chemistry questions

• A sulphuric acid solution has a concentration of 3.60 M and contains 29% $\mathrm{H_2SO_4}$ by mass. If the molar mass of $\mathrm{H_2SO_4}$ is 98 g mol$^{-1}$, what is the density of the solution in g mL$^{-1}$?
• A solution is prepared by dissolving 120 g of a substance with molecular mass 60 in 1000 g of water. If the density of the resulting solution is 1.12 g/mL, what is its molarity?
• Which one of the following substances is absent in clear hard water?
• Fractional distillation is chosen in a situation where
• For an ideal binary solution, if a graph is drawn between $1/x_A$ and $1/y_A$, where $x_A$ is the mole fraction of A in the liquid phase and $y_A$ is the mole fraction of A in the vapour phase, the resulting straight line has which slope and intercept, respectively?
• Car radiators use an aqueous ethylene glycol solution as antifreeze. How much ethylene glycol should be mixed with 5 kg of water so that the freezing point is lowered to $-0.3^\circ$C? $(K_f = 1.86\ \text{K kg mol}^{-1})$

⚔️ Practice JEE Main Chemistry free + battle 1v1 →