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12th Standard English Medium Chemistry Subject Electro Chemistry Book Back 1 Mark Questions with Solution Part - II

12th Standard

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Chemistry

Time : 00:30:00 Hrs
Total Marks : 5

    Part I

    5 x 1 = 5
  1. In the electrochemical cell: Zn|ZnSO4 (0.01M)|| CuSO4 (1.0M)|Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0M and that CuSO4 changed to 0.01M, the emf changes to E2. From the above, which one is the relationship between E1 and E2?

    (a)

    E1 < E2

    (b)

    E1 > E2

    (c)

    E2 ≥ E1

    (d)

    E= E2

  2. Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below:
    \({ BrO }_{ 4 }^{ - }\overset { 1.82V }{ \longrightarrow } { BrO }_{ 3 }^{ - }\overset { 1.5V }{ \longrightarrow } HBrO\overset { 1.595v }{ \longrightarrow } { Br }_{ 2 }\overset { 1.0652V }{ \longrightarrow } Br^{ - }\)
    Then the species undergoing disproportional is

    (a)

    Br2

    (b)

    BrO4-

    (c)

    BrO-3

    (d)

    HBrO

  3. For the cell reaction
    2Fe3+(aq) + 2l(aq) \(\rightarrow\)2Fe2+ (aq) + 12 (aq)
    Eocell = 0.24V  = at 298K. The standard Gibbs energy (Δ, Go) of the cell reactions is:

    (a)

    -46.32 KJ mol−1

    (b)

    -23.16 KJ mol-1

    (c)

    46.32 KJ mol−1

    (d)

    23.16 KJ mol-1

  4. A certain current liberated 0.504gm of hydrogen in 2 hours. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution ______.

    (a)

    31.75

    (b)

    15.8

    (c)

    7.5

    (d)

    63.5

  5. A gas X at 1 atm is bubbled through a solution containing a mixture of 1MY- and 1MZ- at 25oC. If the reduction potential of Z>Y>X, then_____.

    (a)

    Y will oxidize X and not Z

    (b)

    Y will oxidize Z and not X

    (c)

    Y will oxidize both X and Z

    (d)

    Y will reduce both X and Z

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