Electrochemistry MCQ | Questions – Paper 4


Topic: Electrochemistry, Test No.: 04, Total MCQs: 10

Congratulations - you have completed Topic: Electrochemistry, Test No.: 04, Total MCQs: 10. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%
Your answers are highlighted below.
Question 1
A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be [NEET 2013]
A
0.059 V
B
0.59 V
C
0.118 V
D
1.18 V
Question 2
At 25°C molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm–1 cm2 mol–1 and at infinite dilution its molar conductance is 238 ohm–1 cm2 mol–1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is [NEET 2013]
A
20.800%
B
4.008%
C
40.800%
D
2.080%
Question 3

A button cell used in watches functions as following

Zn(s) Ag2O(s) H2O(l)  2Ag(s) + Zn2+ (aq) + 2OH (aq)

If half cell potentials are

Zn2+ (aq) + 2e Zn(s); E° = –0.76 V

Ag2O(s) + H2O(l) + 2e 2Ag(s) + 2OH (aq), E° = 0.34 V

The cell potential will be [NEET 2013]

A
1.10 V
B
0.42 V
C
0.84 V
D
1.34 V
Question 4
The dissociation constant of a work acid is 1 × 10–4. In order of prepare a buffer solution with a pH = 5 the [Salt]/[Acid] ratio should be [NEET 2013]
A
1 : 10
B
4 : 5
C
10 : 1
D
5 : 4
Question 5
Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociates. The value of dissociation constant, Ka, for this acid will be: [NEET 2013]
A
2.8 × 10–4
B
1.4 × 10–5
C
1.4 × 10–4
D
3.7 × 10–4
Question 6
A solution of nickel sulphate in which nickel rod is dipped is diluted 10 times. The reduction potential of Ni at 298 K
A
decreases by 60 mV
B
decreases by 30 mV
C
decreases by 30 V
D
increases by 30 mV
Question 7
Aluminium oxide may be electrolyzed at 1000°C to furnish aluminium metal (At. Mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is Al3+ + 3e → Al.
A
1.83 × 107 C of electricity
B
5.49 × 107 C of electricity
C
5.49 × 101 C of electricity
D
5.49 × 104 C of electricity
Question 8
A certain current liberates 0.504 g of hydrogen in 2 hours. How many grams of oxygen can be liberated by the same current in same time?
A
2.0 g
B
0.4 g
C
4.0 g
D
8.0 g
Question 9
A current of 0.5 amperes is passed for 30 minutes through a voltmeter containing CuSO4 solution. Find the weight of Cu deposited.
A
3.18 g
B
0.318 g
C
0.296 g
D
0.150 g
Question 10
Aluminium displaces hydrogen from acids, but copper does not. A galvanic cell prepared by combining Cu/Cu2+ and Al/Al3+ has an emf of 2.0 V at 298 K. If the potential of copper electrode is +0.34 V, that of aluminium electrode is
A
–2.3 V
B
+2.34 V
C
–1.66 V
D
1.66 V
Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results
There are 10 questions to complete.

Leave a comment

Your email address will not be published. Required fields are marked *