Electrochemistry
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Questions and Answers

What is the primary advantage of fuel cells compared to conventional methods of generating electricity?

  • Higher energy output
  • Higher efficiency due to direct energy conversion (correct)
  • Less maintenance requirements
  • Lower operating costs

What is the significance of H2 O2 fuel cells in space exploration?

  • They can operate in extreme temperatures
  • They are lighter than traditional batteries
  • They offer a continuous source of energy (correct)
  • They provide a reliable source of oxygen

What is the current efficiency of fuel cells, despite expecting 100% efficiency?

  • 40%
  • 50%
  • 80%
  • 60-70% (correct)

What is an environmental advantage of fuel cells compared to conventional energy production?

<p>They do not cause pollution problems (A)</p> Signup and view all the answers

What is the main characteristic of primary cells?

<p>They can be used only once and then become dead (C)</p> Signup and view all the answers

What is the expression for the emf of a voltaic cell?

<p>C0.0591 log⁡(R.H.S)/nC₁(L) (D)</p> Signup and view all the answers

What is the function of the anode in a voltaic cell?

<p>It is the site of oxidation reaction (D)</p> Signup and view all the answers

What is the advantage of using voltaic cells in space exploration?

<p>They are lighter and more compact than conventional energy sources (B)</p> Signup and view all the answers

What is the primary purpose of regulating the diffusion rates of gases into the cell?

<p>To achieve maximum efficiency in the fuel cell (A)</p> Signup and view all the answers

What is the net reaction of the fuel cell described in the text?

<p>The combustion of hydrogen and oxygen to form water (C)</p> Signup and view all the answers

What is the primary advantage of fuel cells over conventional energy production methods?

<p>Higher efficiency and reduced emissions (A)</p> Signup and view all the answers

What is the significance of the Apollo space programme in the context of fuel cells?

<p>It was the first space mission to use fuel cells for electric power (C)</p> Signup and view all the answers

What is the EMF of the fuel cell described in the text?

<p>1.23 V (C)</p> Signup and view all the answers

What is the symbol used to represent conductivity?

<p>κ (B)</p> Signup and view all the answers

What is the unit of conductivity in SI units?

<p>S/m (D)</p> Signup and view all the answers

What is the relation between conductivity and resistivity?

<p>κ = 1/ρ (C)</p> Signup and view all the answers

What is the definition of molar conductivity?

<p>The conducting power of all the ions produced by dissolving one mole of an electrolyte (A)</p> Signup and view all the answers

How is the conductance of a solution experimentally determined?

<p>By measuring its resistance (D)</p> Signup and view all the answers

What is the relationship between conductance and resistance?

<p>Conductance is inversely proportional to resistance (D)</p> Signup and view all the answers

Which of the following electrolytes has high conductance in a solution?

<p>Strong electrolyte (A)</p> Signup and view all the answers

What is the unit of molar conductance in the SI system?

<p>S cm^2 mol^-1 (D)</p> Signup and view all the answers

What is the relationship between specific conductance and molar conductance?

<p>Λ = κ × 1000/M (A)</p> Signup and view all the answers

What is the unit of equivalent conductivity?

<p>S cm^2 eq^-1 (A)</p> Signup and view all the answers

What is the relationship between equivalent conductivity and specific conductance?

<p>Λe = κ × 1000/C (B)</p> Signup and view all the answers

What is the primary factor affecting the conductance of an electrolyte solution?

<p>Type of electrolyte (A)</p> Signup and view all the answers

What is the definition of resistivity?

<p>The resistance of a conductor of 1 cm length and having an area of cross-section equal to 1 cm2 (C)</p> Signup and view all the answers

What is the SI unit of resistivity?

<p>Ohm metre (Ω m) (C)</p> Signup and view all the answers

What is the relationship between conductance and resistance?

<p>Conductance is inversely proportional to resistance (B)</p> Signup and view all the answers

What is the unit of electrical conductance in the SI system?

<p>Siemens (S) (B)</p> Signup and view all the answers

What is the characteristic of electrolytic conduction?

<p>It occurs with decomposition of the substance (A)</p> Signup and view all the answers

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