Visitors Online: 1535  Tuesday 29th July 2014
CBSE Guess > Papers > Important Questions > Class XII > 2013 > Chemistry > IResistance,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 10^{3} ohm. Calculate the resistivity and molar conductivity of the solution.
3. Resistance of 0.01M CH_{3}COOH solution is 2220 ohm. Cell constant is 0.366 cm^{1}. Calculate the degree of dissociation and dissociation of CH_{3}COOH at this concentration. Given Ʌ^{0} HCl, NaCl, CH_{3}COONa are 425,128 and 96 scm^{2} mole^{1} respectively.
4. Ʌ^{0} Al_{2}(SO4)_{3} is 858 scm^{2} mole^{1}. Find Ʌ^{0} of Al^{3+} if Ʌ^{0} of SO_{4}^{2 }is 160 scm^{2} mole^{1}.
Submitted By : Mr. R. Srinivas Vasudevamurthy
Email: vasudm@yahoo.co.uk 
