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Electrochemistry · Question 22

NEET (UG) 2019MCQEasy📈 Topic in 38% papers+4−1
1

For the cell reaction 2Fe3+(aq) + 2I-(aq) 2Fe2+(aq) + I2(aq) E cell = 0.24 V at 298 K. The standard Gibbs energy ( r G ) of the cell reaction is : [Given that Faraday constant F = 96500 C mol-1]

  1. 46.32 kJ mol-1
  2. 23.16 kJ mol-1
  3. -46.32 kJ mol-1
  4. -23.16 kJ mol-1

Answer

(3) -46.32 kJ mol-1

Solution

Half reactions: 2Fe3+ + 2e- 2Fe2+ and 2I- I2 + 2e-

n = 2

As per NCERT, r G = -nF E cell

= -2 96500 0.24 J mol-1

= -46320 J mol-1

= -46.32 kJ mol-1

Answer: (3)

NEET (UG) 2019

Keep practising — Electrochemistry

2

In the electrochemical cell : Zn | ZnSO4 (0.01 M) || CuSO4 (1.0 M) | Cu, the emf of this Daniell cell is E1. When the concentration of ZnSO4 is changed to 1.0 M and that of CuSO4 changed to 0.01 M, the emf changes to E2. From the following, which one is the relationship between E1 and E2? (Given, 2.303RTF = 0.059)

  1. E1 < E2
  2. E1 > E2
  3. E2 = 0 E1
  4. E1 = E2
NEET 2017
3

The pressure of H2 required to make the potential of H2-electrode zero in pure water at 298 K is

  1. 10-10 atm
  2. 10-4 atm
  3. 10-14 atm
  4. 10-12 atm
NEET 2016 (Phase 1)
4

The molar conductivity of a 0.5 mol/dm3 solution of AgNO3 with electrolytic conductivity of 5.76 10-3 S cm-1 at 298 K is

  1. 2.88 S cm2/mol
  2. 11.52 S cm2/mol
  3. 0.086 S cm2/mol
  4. 28.8 S cm2/mol
NEET 2016 (Phase 2)
5

During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 3 amperes is

  1. 55 minutes
  2. 110 minutes
  3. 220 minutes
  4. 330 minutes
NEET 2016 (Phase 2)
6

If the E cell for a given reaction has a negative value, which of the following gives the correct relationships for the values of G and Keq ?

  1. G > 0; Keq < 1
  2. G > 0; Keq > 1
  3. G < 0; Keq > 1
  4. G < 0; Keq < 1
NEET 2016 (Phase 2)
7

The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge on electron = 1.60 10-19 C)

  1. 6 1023
  2. 6 1020
  3. 3.75 1020
  4. 7.48 1023
NEET 2016 (Phase 2)
8

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

  1. zinc is lighter than iron
  2. zinc has lower melting point than iron
  3. zinc has lower negative electrode potential than iron
  4. zinc has higher negative electrode potential than iron
NEET 2016 (Phase 2)
9

Aqueous solution of which of the following compounds is the best conductor of electric current ?

  1. Hydrochloric acid, HCl
  2. Ammonia, NH3
  3. Fructose, C6H12O6
  4. Acetic acid, C2H4O2
AIPMT 2015
10

A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as

  1. dynamo
  2. Ni-Cd cell
  3. fuel cell
  4. electrolytic cell
AIPMT 2015 (Cancelled)
11

When 0.1 mol MnO42- is oxidised the quantity of electricity required to completely oxidise MnO42- to MnO4- is

  1. 96500 C
  2. 2 96500 C
  3. 9650 C
  4. 96.50 C
AIPMT 2014

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