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Chemistry Test 220
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Chemistry Test 220
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  • Question 1/10
    4 / -1

    A 19th century iron bridge is protected from corrosion by connecting it to a block of metal (sacrificial anode), which is replaced annually. The corrosion of iron, represented by the chemical equation:

    Which of the following metals is best suited as sacrificial anode:

  • Question 2/10
    4 / -1

    The cell potential for the following electrochemical system at 25°C is:

    Al(s) | Al3+ (0.01 M) || Fe2+ (0.1 M) | Fe (s)

    Given: Standard reduction potential of Al3+ + 3e– → Al is –1.66 V at 25°C

    Standard reduction potential of Fe2+ + 2e– → Fe is –0.44 V at 25°C

    Solutions

     

  • Question 3/10
    4 / -1

    The species present in solution when CO2 dissolved in water, are

    Solutions

    H2CO3 is formed by dissolution of CO2 into water. This dissociates into H+ and HCO3-. This is the first dissociation of H2CO3. Since HCO3- has another H, it again dissociates to H+ and CO32-. H+ obtained attacks the lone pair of H2O to form H3O+. So H3O+, HCO3-, CO32-, H2CO3 are present in water when CO2 is dissolved in  water.

     

  • Question 4/10
    4 / -1

    The reduction potential of an element A is 1.71 V. What can be concluded from this?

    Solutions

    The standard reduction potential is the tendency for a chemical species to be reduced, and is measured in volts at standard conditions.

    The more positive the potential is the more likely it will be reduced. Hence, A will undergo reduction easily.

     

  • Question 5/10
    4 / -1

    Aerated water contains CO2 dissolved in water

    Variation of solubility (s) with pressure (p) is shown by

    Solutions

    Pressure increase solubility also increase in accordance with the Henry's law and option B is the closest to this. Hence B is correct.

     

  • Question 6/10
    4 / -1

    Which of the following involves a redox reaction?

    Solutions

     

  • Question 7/10
    4 / -1

    The equilibrium constant of the reaction:

    E° = 0.46 V at 298 K is

    Solutions

     

  • Question 8/10
    4 / -1

    Solutions

     

  • Question 9/10
    4 / -1

    Solubility of MX2-type eletrolytes is 0.5 × 10–4 mole/lit, then find out Ksp of electrolytes

    Solutions

     

  • Question 10/10
    4 / -1

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