Question
The graphical variation of molar conductivity ( ) against square root of molar concentration ( c ) of certain electrolyte 'X' is linear with intercept on y axis. Identify X from following.
MHT CET
Chemistry
Electrochemistry
2026
MHT CET 2026 (17 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. CH _3 COOH
- B. NH _4 OH
- C. HCOOH
- D. CH _3 COONa
Answer
D. CH _3 COONa
Step-by-step solution
According to the Debye-Hückel-Onsager equation, the variation of molar conductivity _m with the square root of concentration c is given by _m = _m^ - A c . This linear relationship with a definite y-intercept ( _m^ ) is observed only for strong electrolytes. Weak electrolytes show a steep curve at low concentrations and do not have a linear plot or a well-defined intercept. Among the given options, CH _3 COOH , NH _4 OH , and HCOOH are weak electrolytes. CH _3 COONa is a salt of a weak acid and a strong base, making it a strong electrolyte. Therefore, CH _3 COONa will show a linear variation with an intercept on the y-axis. Answer: CH _3 COONa
Related: Chemistry — Electrochemistry · All PYQ Banks