Topic: Electrochemistry, Test No.: 04, Total MCQs: 10
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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]
0.059 V | |
0.59 V | |
0.118 V | |
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]
20.800% | |
4.008% | |
40.800% | |
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]
1.10 V | |
0.42 V | |
0.84 V | |
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]
1 : 10 | |
4 : 5 | |
10 : 1 | |
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]
2.8 × 10–4 | |
1.4 × 10–5 | |
1.4 × 10–4 | |
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
decreases by 60 mV | |
decreases by 30 mV | |
decreases by 30 V | |
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.
1.83 × 107 C of electricity | |
5.49 × 107 C of electricity | |
5.49 × 101 C of electricity | |
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?
2.0 g | |
0.4 g | |
4.0 g | |
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.
3.18 g | |
0.318 g | |
0.296 g | |
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
–2.3 V | |
+2.34 V | |
–1.66 V | |
1.66 V |
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