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Electrochemistry · Question 67

AIPMT 2000MCQEasy📈 Topic in 38% papers+4−1
1

Cell reaction is spontaneous when

  1. is negative
  2. is positive
  3. E red is positive
  4. E red is negative

Answer

(1) is negative

Solution

As per NCERT, rG = - nFE cell

A reaction is spontaneous when its Gibbs energy change is negative.

⇒ For a spontaneous cell reaction, is negative (and E cell is positive).

Answer: (1)

AIPMT 2000

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2

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

  1. 139.5
  2. 101.5
  3. 203
  4. 279
AIPMT 2000
3

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.)

  1. 0.49 V
  2. -0.19 V
  3. 0.38 V
  4. -0.38 V
AIPMT 2000

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