Uttar Pradesh PSC Exam: Chemistry MCQs (Practice_Test 15 of 31)

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  1. A galvanic cell is constructed from a half cell containing a solid copper electrode in 1.0 M Cu (NO3) 2 solution and a half cell containing a solid aluminum electrode in 1.0 M Al (NO3) 3 solution at standard conditions. The half cells are linked by an external circuit and by a KCl salt bridge.
    1. N/A
    2. N/A
    3. N/A
    4. N/A
  2. The balanced overall (net) cell reaction for a spontaneous process is:
    1. Cu (s) + Al3 + (aq) ⇾ Cu2 + (aq) + Al (s)
    2. 3 Cu (s) + 2 Al3 + (aq) ⇾ 3 Cu2 + (aq) + 2 Al (s)
    3. 3 Cu2 + (aq) + 2 Al (s) ⇾ 3 Cu (s) + 2 Al3 + (aq)
    4. Cu2 + (aq) + Al (s) ⇾ Cu (s) + Al3 + (aq)
    5. The reaction is not spontaneous.
  3. Which of the following statements is TRUE about this cell?
    1. The aluminum electrode is the anode; the copper electrode is the cathode.
    2. The electrons flow from the copper electrode to the aluminum electrode.
    3. The cell diagram is|Cu solid|Cu2 + , 1.0 M|salt bridge|Al solid|Al3 + , 1.0 M|
    4. G is greater than zero.
    5. S is the driving force of this reaction.
  4. This cell generates a standard potential of:
    1. + 1.32 V
    2. -2.00 V
    3. -1.32 V
    4. + 2.00 V
    5. The cell is at equilibrium.
  5. An expression for the equilibrium constant of this reaction at 25oC is:
    1. e205
    2. e298
    3. e467
    4. e831
    5. e965
  6. You have installed a new hot water heater in your house, and you notice that the iron tank has a large metal bar bolted to it on the inside. You conclude that this bar is a sacrificial anode and that it could be made of:
    1. Ag
    2. Ni
    3. Pb
    4. Sn
    5. Mg
  7. We used copper and zinc electrodes stuck in an apple to run a small clock. Which of the following statements must be TRUE?
    1. The zinc strip was the anode
    2. The apple was the salt bridge
    3. Ecell > 0
    4. G < 0
    5. All of these statements are true

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