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Electrochemistry · Question 39

AIPMT 2012 (Mains)MCQEasy📈 Topic in 12% papers+4−1
1

Standard reduction potentials of the half reactions are given below : F2(g) + 2e- 2F-(aq); E = +2.85 V Cl2(g) + 2e- 2Cl-(aq); E = +1.36 V Br2(l) + 2e- 2Br-(aq); E = +1.06 V I2(s) + 2e- 2I-(aq); E = +0.53 V The strongest oxidising and reducing agents respectively are

  1. F2 and I-
  2. Br2 and Cl-
  3. Cl2 and Br-
  4. Cl2 and I2

Answer

(1) F2 and I-

Solution

The higher the standard reduction potential, the greater the tendency of the species to be reduced ⇒ the stronger the oxidising agent.

Highest E = +2.85 V ⇒ F2 is the strongest oxidising agent.

The lower the reduction potential, the greater the tendency of the reduced form to be oxidised ⇒ the stronger the reducing agent.

Lowest E = +0.53 V ⇒ I- is the strongest reducing agent.

Answer: (1)

AIPMT 2012 (Mains)

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2

Molar conductivities ( m) at infinite dilution of NaCl, HCl and CH3COONa are 126.4, 425.9 and 91.0 S cm2 mol-1 respectively. ( m) for CH3COOH will be

  1. 425.5 S cm2 mol-1
  2. 180.5 S cm2 mol-1
  3. 290.8 S cm2 mol-1
  4. 390.5 S cm2 mol-1
AIPMT 2012 (Mains)
3

Limiting molar conductivity of NH4OH [i.e. 0m(NH4OH)] is equal to

  1. 0m(NH4OH) + 0m(NaCl) - 0m(NaOH)
  2. 0m(NaOH) + 0m(NaCl) - 0m(NH4Cl)
  3. 0m(NH4OH) + 0m(NH4Cl) - 0m(HCl)
  4. 0m(NH4Cl) + 0m(NaOH) - 0m(NaCl)
AIPMT 2012 (Prelims)
4

A solution contains Fe2+, Fe3+ and I- ions. This solution was treated with iodine at 35 C. E for Fe3+/Fe2+ is +0.77 V and E for I2/2I- = 0.536 V. The favourable redox reaction is

  1. I2 will be reduced to I-
  2. there will be no redox reaction
  3. I- will be oxidised to I2
  4. Fe2+ will be oxidised to Fe3+
AIPMT 2011 (Mains)
5

Standard electrode potential of three metals X, Y and Z are -1.2 V, +0.5 V and -3.0 V respectively. The reducing power of these metals will be

  1. Y > Z > X
  2. Y > X > Z
  3. Z > X > Y
  4. X > Y > Z
AIPMT 2011 (Prelims)
6

The electrode potentials for Cu2+(aq) + e- Cu+(aq) and Cu+(aq) + e- Cu(s) are +0.15 V and +0.50 V respectively. The value of E Cu2+/Cu will be

  1. 0.500 V
  2. 0.325 V
  3. 0.650 V
  4. 0.150 V
AIPMT 2011 (Prelims)
7

Standard electrode potential for Sn4+/Sn2+ couple is +0.15 V and that for the Cr3+/Cr couple is -0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be

  1. +1.19 V
  2. +0.89 V
  3. +0.18 V
  4. +1.83 V
AIPMT 2011 (Prelims)
8

Which of the following expressions correctly represents the equivalent conductance at infinite dilution of Al2(SO4)3. Given that Al3+ and SO42- are the equivalent conductances at infinite dilution of the respective ions?

  1. 2 Al3+ + 3 SO42-
  2. Al3+ + SO42-
  3. ( Al3+ + SO42-) 6
  4. 13 Al3+ + 12 SO42-
AIPMT 2010 (Mains)
9

Consider the following relations for emf of an electrochemical cell (i) EMF of cell = (Oxidation potential of anode) − (Reduction potential of cathode) (ii) EMF of cell = (Oxidation potential of anode) + (Reduction potential of cathode) (iii) EMF of cell = (Reduction potential of anode) + (Reduction potential of cathode) (iv) EMF of cell = (Oxidation potential of anode) − (Oxidation potential of cathode) Which of the above relations are correct?

  1. (iii) and (i)
  2. (i) and (ii)
  3. (iii) and (iv)
  4. (ii) and (iv)
AIPMT 2010 (Mains)
10

For the reduction of silver ions with copper metal, the standard cell potential was found to be +0.46 V at 25 C. The value of standard Gibbs energy, G will be (F = 96500 C mol-1)

  1. -89.0 kJ
  2. -89.0 J
  3. -44.5 kJ
  4. -98.0 kJ
AIPMT 2010 (Prelims)
11

An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to

  1. increase in ionic mobility of ions
  2. 100% ionisation of electrolyte at normal dilution
  3. increase in both i.e., number of ions and ionic mobility of ions
  4. increase in number of ions.
AIPMT 2010 (Prelims)

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