Electrochemistry

AIPMT 2000MCQMedium📈 Topic in 25% papers+4−1

Ques. 1AIPMT 2000

Ionic conductances of Ba2+ and Cl- ions at infinite dilution are 127 and 76 ohm-1 cm2 mol-1 respectively. Equivalent conductance of BaCl2 at infinite dilution is

139.5
101.5
203
279

Answer

(1) 139.5

Solution

As per NCERT (Kohlrausch's law), m = + + + - -, and BaCl2 Ba2+ + 2Cl-, so

m(BaCl2) = ( Ba2+) + 2 (Cl-)

= 127 + 2 76

= 279 ohm-1 cm2 mol-1

One mole of BaCl2 contains 2 equivalents (total charge on cations = 2), so

eq(BaCl2) = m2 = 2792

= 139.5 ohm-1 cm2 eq-1

Answer: (1)

Keep practising — Electrochemistry

Ques. 2AIPMT 2000

For the disproportionation of copper 2Cu+ Cu2+ + Cu, E is (Given E for Cu2+/Cu is 0.34 V and E for Cu2+/Cu+ is 0.15 V.)

0.49 V
-0.19 V
0.38 V
-0.38 V

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