CBSE Guess > Papers > Important Questions > Class XII > 2013 > Chemistry > I-Resistance,conductivity and Kohlrausch law (Numerical) By Mr. R. Srinivas Vasudevamurthy

CBSE CLASS XII

Resistance,conductivity and Kohlrausch law (Numerical)

1. Resistance of a conductivity cell filled with 0.1M KCl is 100 ohm. If the resistance of the same cell filled with 0.02 M KCl is 520 ohm, calculate the conductivity and molar conductivity of 0.02 M KCl. Conductivity of the 0.1M KCl is 1.29 s/m.

2. Resistance of a column of 0.05 M NaOH solution of diameter 1 cm and length 50 cm is 5.55 x 10³ ohm. Calculate the resistivity and molar conductivity of the solution.

3. Resistance of 0.01M CH₃COOH solution is 2220 ohm. Cell constant is 0.366 cm^-1. Calculate the degree of dissociation and dissociation of CH₃COOH at this concentration. Given Ʌ⁰ HCl, NaCl, CH₃COONa are 425,128 and 96 scm² mole^-1 respectively.

4. Ʌ⁰ Al₂(SO4)₃ is 858 scm² mole^-1. Find Ʌ⁰ of Al³⁺ if Ʌ⁰ of SO₄^2- is 160 scm² mole^-1.

 

Submitted By : Mr. R. Srinivas Vasudevamurthy
Email: [email protected]