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

1. Y will oxidise X and not Z

2. Y will oxidise Z and not X

3. Y will oxidise both X and Z

4. Y will reduce both X and Z

Subtopic:  Electrochemical Series |
 66%
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The solution of CuSO4 in which copper rod is immersed is diluted to 10 times, the reduction electrode potential:

1. increases by 0.030 V

2. decreases by 0.030 V

3. increases by 0.059 V

4. decreases by 0.059 V

Subtopic:  Nernst Equation |
 50%
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A solution containing one mole per litre each of Cu(NO3)2, AgNO3, Hg2(NO3)2 and Mg(NO3)2 is being electrolyzed by using inert electrodes. The values of standard electrode potentials in volt (reduction potentials) are,

Ag/Ag = 0.80 V, Hg22+/2Hg = 0.79 V,

Cu2+/Cu = +0.34 V and Mg2+/Mg = -2.37 V

With increasing voltage, the sequence of deposition of metals on the cathode will be:

1. Ag, Hg, Cu, Mg

2. Mg, Cu, Hg, Ag

3. Ag, Hg, Cu

4. Cu, Hg, Ag

Subtopic:  Electrochemical Series |
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The highest electrical conductivity of the following aqueous solution is of:

1. 0.1 M acetic acid

2. 0.1 M chloroacetic acid

3. 0.1 M fluoro acetic acid

4. 0.1 M difluoro acetic acid

Subtopic:  Conductance & Conductivity |
 72%
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Standard reduction potentials at 25°C of Li+/Li, Ba2+/Ba, Na+/Na and Mg2+/Mg are -3.05, -2.90, -2.71 and -2.37 V respectively. Which one of the following is the strongest oxidising agent ?

1. Mg2+

2. Ba2+

3. Na+

4. Li+

Subtopic:  Electrode & Electrode Potential |
 78%
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Equivalent conductances of NaCl, HCl and C2H5COONa at infinite dilution are 126.45, 426.16 and 91 Ω-1cm2. The equivalent conductance of C2H5COOH is : 

1. 201.28 Ω-1cm2

2. 390.71 Ω-1cm2

3. 698.28 Ω-1cm2

4. 540.48 Ω-1cm2

Subtopic:  Conductance & Conductivity |
 91%
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The equivalent conductance of M/32 solution of a weak monobasic acid is 8.0 mho cm2 and at infinite dilution is 400 mhocm2. The dissociation constant of the acid is

1. 1.25 x 10-5

2. 1.25 x 10-6

3. 6.25 x 10-4

4. 1.25 x 10-4

Subtopic:  Conductance & Conductivity |
 61%
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The change in reduction potential of a hydrogen electrode when its solution initialy at pH = 0 is neutralised to pH = 7, is a/an-

1. Increase by 0.059 V 2. Decrease by 0.059 V
3. Increase by 0.41 V 4. Decrease by 0.41 V
Subtopic:  Electrode & Electrode Potential | Nernst Equation |
 52%
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 The cell reaction for the given cell is spontaneous if:

Ptcl2|cl-(1M)||Cl-(1M)|PtCl2

1. P1 > P2 

2. P1 < P2

3. P1 = P2

4. P1 = 1 atm

Subtopic:  Electrode & Electrode Potential |
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Each of the three metals X, Y and Z were put in turn into aqueous solution of the other two.

X + Salt of Y (or Z)   Y (or Z) + Salt of X.

Which observation is probably incorrect?

1. Y + Salt of X = No action observed

2. Y + Salt of Z = Z + Salt of Y

3. Z + Salt of X = X + Salt of Z

4. Z + Salt of Y = No action observed

Subtopic:  Electrochemical Series |
 59%
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