Topic: Electrochemistry, Test No.: 03, Total MCQs: 15
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Question 1 |
In the electrolysis of acidulated water, it is desired to obtain 1.12 cc of hydrogen per second under S.T.P. conditions. The current to be passed is [Karnataka CET 2009]
0.965 Amp | |
19.3 Amp | |
9.65 Amp | |
1.93 Amp |
Question 2 |
The one which decreases with dilution is [Karnataka CET 2009]
conductance | |
specific conductance | |
equivalent conductance | |
molar conductance |
Question 3 |
The standard electrode potential for the half cell reactions are
Zn++ + 2e– → Zn, Eo = – 0.76 V
Fe++ + 2e– → Fe, Eo = – 0.44 V
The e.m.f. of the cell reaction
Fe++ + Zn → Zn++ + Fe is [Karnataka CET 2009]
–1.20 V | |
+1.20 V | |
+0.32 V | |
–0.32 V |
Question 4 |
Given
(i) Cu2+ + 2e- → Cu, Eo = 0.337 V
(ii) Cu2+ + e- → Cu+, Eo = 0.153 V
Electrode potential E° for the reaction Cu+ + e– → Cu will be [CBSE AIPMT 2009]
0.90 V | |
0.30 V | |
0.38 V | |
0.52 V |
Question 5 |
Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 × 104 amperes of current is passed through molten Al2O3 for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency, atomic mass of Al = 27 g/mol) [CBSE AIPMT 2009]
1.3 × 104 g | |
2.4 × 105 g | |
8.1 × 104 g | |
9.0 × 103 g |
Question 6 |
The equivalent conductance of M/32 solution of a weak monobasic acid is 8.0 mhos cm2 and at infinite dilution is 400 mhos cm2. The dissociation constant of this acid is [cbse aipmt 2009]
1.25 × 10-6 | |
6.25 × 10-4 | |
1.25 × 10-4 | |
1.25 × 10-5 |
Question 7 |
Standard free energies of formation (in kJ/mol) at 298 K are –237.2, –394.4 and –8.2 for H2O(l), CO2(g) and pentane (g), respectively. The value of Eocell for the pentane-oxygen fuel cell is [CBSE AIPMT 2008]
2.0968 V | |
1.0968 V | |
0.0968 V | |
1.968 V |
Question 8 |
On the basis of the following E° values, the strongest oxidizing agent is: [CBSE AIPMT 2008]
[Fe(CN)6]4– → [Fe(CN)6]3– + e–1; Eo = –0.35 V
Fe2+ → Fe3+ + e–1; Eo = –0.77 V
Fe2+ | |
Fe3+ | |
[Fe(CN)6]3– | |
[Fe(CN)6]4– |
Question 9 |
Electrometer | |
Voltmeter | |
Pyrometer | |
Galvanometer |
Question 10 |
Corrosion of iron is essentially an electrochemical phenomenon where the cell reaction are ______. [Karnataka CET 2005]
Fe is oxidised to Fe2+ and dissolved oxygen in water is reduced to OH– | |
Fe is
oxidised to Fe3+ and H2O is reduced to | |
Fe is
oxidised to Fe2+ and H2O is reduced to | |
Fe is oxidised to Fe2+ and H2O is reduced to O2 |
Question 11 |
Aluminium displaces hydrogen from dilute HCl whereas silver does not. The E.M.F. of a cell prepared by combining Al/Al+3 and Ag/Ag+ is 2.46 V. The reduction potential of silver electrode is + 0.80 V. The reduction potential of aluminium electrode is: [Karnataka CET 2004]
+1.66 V | |
–1.66 V | |
3.26 V | |
–3.26 V |
Question 12 |
For a cell reaction involving two electrons change, the standard e.m.f. of the cell is found to be 0.295 V at 25°C. The equilibrium constant of the reaction at 25°C is [AIEEE 2003]
2.95 × 102 | |
10 | |
1 × 1010 | |
1 × 10-10 |
Question 13 |
On the basis of information available for the reaction:
Al
+ O2 → 2Al2O3;
ΔG = –827 kJ mol–1 of O2.
The minimum e.m.f. required to carry out the electrolysis of Al2O3 is (F = 96500 C mol–1) [CBSE AIPMT 2003]
2.14 V | |
4.28 V | |
6.42 V | |
8.56 V |
Question 14 |
When KMnO4 acts as an oxidizing agent and ultimately forms MnO42–, MnO2, Mn2O3 and Mn2+, then the number of electrons transferred in each case is [AIEEE 2002]
1, 3, 4, 5 | |
1, 5, 3, 7 | |
4, 3, 1, 5 | |
3, 5, 7, 1 |
Question 15 |
Which of the following is a redox reaction? [AIEEE 2002]
Mg(OH)2 + 2NH4Cl → MgCl2 + 2NH4OH | |
CaC2O4 + 2HCl → CaCl2 + H2C2O4 | |
NaCl + KNO3 → NaNO3 + KCl | |
Zn + 2AgCN → 2Ag + Zn (CN)2 |