Electrochemistry Test

Result

Electrochemistry Test - 11

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Weekly Quiz Competition

Question 1
1 / -0.25

A current of 0.1A was passed for 2hr through a solution cuprocyanide and 0.3745g f copper was deposited on the cathode. Calculate the current efficiency for the copper deposition.

A
79%

B
39.5%

C
63.25%

D
63.5%

Solution
Question 2
1 / -0.25

With t taken in seconds and I taken in Amp, the variation of I follows the equation

t² + I² = 25

what amount of Ag will be electrodeposited with this current flowing in the interval 0-5 second ? (Ag : 108)

A
22mg

B
66mg

C
77mg

D
88mg

Solution

=21.97mg = 22mg
Question 3
1 / -0.25

A resistance of 50 Ω is registered when two electrodes are suspended into a beaker containing a dilute solution of a strong electrolyte such that exactly half of the them are submerged into solution. If the solution is diluted by adding pure water (negligible conductivity) so as to just completely submerge the electrodes, the new resistance offered by the solution would be

A
50 Ω

B
100 Ω

C
25 Ω

D
200 Ω

Solution

the k is halved while the A is doubled. Hence R remain 50 Ω.
Question 4
1 / -0.25

The standard reduction potential of a silver chloride electrode is 0.2 V and that of a silver electrode is 0.79 V. The maximum amount of AgCl that can dissolve in 10⁶ L of a 0.1 M AgNO₃ solution is

A
0.5 mmol

B
1.0 mmol

C
2.0 mmol

D
2.5 mmol

Solution
Question 5
1 / -0.25

Calculate the cell EMF in mV for

Pt|H₂ (1atm) |HCl(0.01M)|AgCl(s)| Ag(s)        at 298 K

If ΔG °r values are at 25 °C

for AgCl(s) and for H⁺ + Cl^- ) (aq)

A
456 mV

B
654 mV

C
546 mV

D
None of these.

Solution
Question 6
1 / -0.25

Adiponitrile is manufactured electrolytically from acrylonitrile

CH₂ = CHCN → CN –(CH₂ )₄ –CN

How many kg of adiponitrile (molecular mass = 108) is produced in 9.65 hr using a current of 3750 A with 80% efficiency

A
30 kg

B
58 kg

C
60 kg

D
80 kg

Solution
Question 7
1 / -0.25

It is observed that the voltage of a galvanic cell using the reaction M(s) + xH⁺ → M^x+ + X/2H₂ varies linearly with the log of the square root of the hydrogen pressure and the cube root of the M^x+ concentration. The value of x is

A
2

B
3

C
4

D
5

Solution
Question 8
1 / -0.25

Acetic acid has K_a = 1.8 X 10 ^–5 while formic acid had K_a = 2.1 X 10^–4 . What would be the magnitude of the emf of the cell

A
0.0315 volt

B
0.0629 volt

C
0.0455 volt

D
0.0545 volt

Solution
Question 9
1 / -0.25

Consider the cell Ag(s)|AgBr(s)|Br-(aq)||AgCl(s)|Cl-(aq)|Ag(s) at 25 °C. The solubility product constants of AgBr &AgCl are respectively 5 X 10 ^–13 &1 X 10 ^–10 . For what ratio of the concentrations of Br^- &Cl^- ions would the emf of the cell be zero ?

A
1 : 2000

B
1 : 100

C
1 : 500

D
200 : 1

Solution
Question 10
1 / -0.25

Value of for SrCl₂ in water at 25 °C from the following data:

A
270

B
260

C
250

D
255

Solution