Degree of dissociation and Ka from conductivity

8 questions on Degree of dissociation and Ka from conductivity from the Electrochemistry chapter: 1 NEET level, 3 JEE Main, 4 JEE Advanced. Each one opens with its answer and solution.

• The molar conductivity of a 0.10 M solution of a weak monobasic acid is 7.8 S cm^2 mol^-1 and its limiting molar conductivity is 390 S cm^2 mol^-1. The degree o... NEET level
• A 0.050 M solution of a weak monobasic acid HA has molar conductivity 7.81 S cm^2 mol^-1. The limiting molar conductivity of HA is 390.5 S cm^2 mol^-1. Using K_... JEE Main level
• A 0.010 M solution of a weak monobasic acid HA is placed in a conductivity cell of cell constant 0.39 cm^-1 and shows a resistance of 1000 Omega. The limiting m... JEE Advanced level
• A weak monobasic acid has K_a = 1.8x 10^-5 and limiting molar conductivity 390.5 S cm^2 mol^-1. Assuming alpha ll 1, the molar conductivity of its 0.10 M soluti... JEE Main level
• Assertion (A): For a weak electrolyte, the degree of dissociation at concentration c can be taken as alpha = Lambda_m/Lambda deg_m. Reason (R): It is assumed th... JEE Main level
• A conductivity cell of cell constant 0.75 cm^-1 filled with a 0.020 M solution of a weak monobasic acid HA shows a resistance of 2500 Omega. The limiting molar ... JEE Advanced level
• A weak monobasic acid HA is 10.0% dissociated in a 0.0100 M solution. Its limiting molar conductivity is 400 S cm^2 mol^-1. Without using the approximation 1 - ... JEE Advanced level
• A 0.0100 M solution of NH4OH has molar conductivity 11.27 S cm^2 mol^-1. The limiting molar conductivity of NH4OH is 271.4 S cm^2 mol^-1 and K_w = 1.0x 10^-14. ... JEE Advanced level