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Quiz 192
Mdcat-past-papers Quiz
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3821. Which of the following is NOT a correct feature of electrolytic cells?
Reduction occurs at cathode
Oxidation occurs at anode
Alternating current source is connected to electrodes
Electrochemical reaction takes place
3822. Electrolysis of dilute acid solution gives:
Cl₂ at cathode & H₂ at anode
H₂ at cathode & O₂ at anode
H₂ at cathode & Cl₂ at anode
H₂ at anode & Na at cathode
3823. In Castner-Kellner cell:
NaOH + H₂ are produced at cathode
Cl₂ is produced at anode
NaOH + H₂ are produced at anode
NaOH + H₂ is produced at cathode & Cl₂ is produced at anode
3824. A strong electrolyte is one that:
Reacts
Disappears
Ionizes completely
Never ionizes
3825. During electrolysis of concentrated aqueous solution of NaCl, which ion is NOT discharged at cathode?
Na⁺
Cl⁻
H⁺
OH⁻
3826. Which of the following cell reactions correctly represent the electrolysis of water?
2H⁺ + 2e⁻ → H₂(g)
2H₂O → 2H₂(g) + O₂(g)
2H₂O + 2e⁻ → 2OH⁻ + H₂(g)
2H₂O → O₂(g) + 4H⁺ + 4e⁻
3827. The breakdown of a substance with current is:
Thermolysis
Catalysis
Electrolysis
Photolysis
3828. Reduction occurs at:
Anode
Cathode
Both
None
3829. Coinage metals Cu, Ag and Au are the least reactive because they have:
Negative reduction potential
Positive reduction potential
Negative oxidation potential
Positive oxidation potential
3830. The standard electrode potential of hydrogen is arbitrarily taken at 298 K is:
0.00 volt
0.10 volt
10.0 volt
1.0 volt
3831. The potential difference of an electrochemical cell is measured by:
Ammeter
Voltmeter
Galvanometer
Calorimeter
3832. In electrochemical series, what is the electrode potential of all metals above hydrogen?
Zero
Negative
Positive
Greater than zero
3833. Which statement correctly describes the standard electrode potential?
It is the electrode potential determined at room temperature and pressure
It is the electrode potential determined under standard conditions using standard hydrogen electrode as the other electrode
It is the electrode potential of an element and its solution compared to a standard value
It is the potential which is measured when two half cells are connected together
3834. A cathode has reduction potential:
Less than anode
More than anode
Same as that of anode
Zero
3835. Super batteries with high charge density are also called:
Primary batteries
Secondary batteries
Solar batteries
Fuel batteries
3836. The electrode potential of the standard hydrogen electrode is chosen as:
-1V
1V
0V
2V
3837. Lower members in electrochemical series cause:
Reduction
Oxidation
Are noble gases
Do not give any reaction
3838. Element with highest reduction potential is:
F
Cl
Li
Mg
3839. Reduction of copper is due to electrode potential of:
0.76
-0.76
0.34
-0.34
3840. Zn rod acts as cathode when coupled with magnesium electrode. This is because the reduction potential of:
Zn > Mg
Zn < Mg
Zn = Mg
Zn = 0
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