Which among the following factors is the most important in makin

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Given the data at 25oC,
Ag + I- → Agl +e-; Eo = 0.152 V
Ag → Ag+ + e;Eo = -0.800 V
What is the value of log Ksp for Agl?
(2.303RT/F = 0.059 V)

  • –8.12

  • +8.612

  • –37.83

  • –37.83

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22.

Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.1 M is 100 Ω. The conductivity of this solution is 1.29 Sm–1. Resistance of the same cell when filled with 0.2 M of the same solution is 520 Ω.The molar conductivity of 0.02 M solution of the electrolyte will be

  • 124 × 10–4 Sm2 mol–1

  • 1240 × 10–4 Sm2 mol–1

  • 1.24 × 10–4 Sm2 mol–1

  • 1.24 × 10–4 Sm2 mol–1

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23.

The ionic mobility of alkali metal ions in aqueous solution is maximum for

  • K+

  • Rb+

  • Li+

  • Li+

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24.

If α is the degree of dissociation of Na2SO4, the vant Hoff’s factor (i) used for calculating the molecular mass is

  • 1 + α

  • 1 - α

  • 1 +2α

  • 1 +2α

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25.

The highest electrical conductivity of the following aqueous solutions is of

  • 0.1 M acetic acid

  • 0.1 M chloroacetic acid

  • 0.1 M fluoroacetic acid

  • 0.1 M fluoroacetic acid

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26.

Aluminium oxide may be electrolysed at 1000o  C to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is

Al3+ +3e- → Alo
To prepare 5.12 kg of aluminium metal by this method would require

  • 5.49 x 107 C of electricity

  • 1.83 x 107 C of electricity

  • 1.49x 107 C of electricity

  • 1.49x 107 C of electricity

386 Views

27.
Electrolyte KCl KNO3 HCl NaOAc NaCl
S cm2 mol- 149.9 145.0 426.2 91.0 126.5

Calculate ∧HOAc Using appropriate molar conductances of the electrolytes listed above at infinite dilution in H2O at 25°C
  • 517.2

  • 552.7

  • 390.7

  • 390.7

319 Views

28.

Calomel (Hg2Cl2) on reaction with ammonium hydroxide gives

  • HgNH2Cl

  • NH2 – Hg – Hg – Cl

  • Hg2O

  • Hg2O

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29.

Which among the following factors is the most important in making fluorine the strongest oxidizing halogen?

  • Electron affinity

  • Bond dissociation energy

  • Hydration enthalpy

  • Hydration enthalpy


B.

Bond dissociation energy

Oxidising power depends on the (+ve) reduction potential value, and (-ve) value of Gibbs free energy. 
F2 has the most negative ΔG° value which dependent on hydration enthalpy.

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30.

In hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

  • generate heat

  • remove adsorbed oxygen from electrode surfaces

  • produce high purity water

  • produce high purity water

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