#1
What is the oxidation state of oxygen in H2O2?
-1
ExplanationOxygen in peroxides exhibits an oxidation state of -1.
#2
In the reaction Zn + CuSO4 → ZnSO4 + Cu, which species is being oxidized?
Zn
ExplanationZinc (Zn) undergoes oxidation, losing electrons to form Zn²⁺ ions.
#3
Which of the following is true about a reducing agent?
It gains electrons
ExplanationA reducing agent gains electrons, facilitating reduction reactions.
#4
What is the chemical formula of permanganate ion?
MnO4^-
ExplanationThe chemical formula of permanganate ion is MnO₄⁻.
#5
What is the half-reaction for the reduction of silver ions to silver metal?
Ag⁺ + e⁻ → Ag
ExplanationThe half-reaction for the reduction of silver ions involves gaining electrons to form silver metal.
#6
Which of the following is a disproportionation reaction?
2H₂O₂ → 2H₂O + O₂
ExplanationDisproportionation reaction involves an element being both oxidized and reduced simultaneously.
#7
What is the standard electrode potential of hydrogen electrode?
+1.23 V
ExplanationThe standard electrode potential of hydrogen electrode is +1.23 V.
#8
Which of the following is a strong oxidizing agent?
Cl2
ExplanationChlorine (Cl₂) is a strong oxidizing agent, readily accepting electrons.
#9
What is the standard reduction potential of copper electrode?
+0.80 V
ExplanationThe standard reduction potential of copper electrode is +0.80 V.
#10
Which of the following is a primary battery?
Lead-acid battery
ExplanationLead-acid battery is a type of primary battery.
#11
What is the standard electrode potential of standard hydrogen electrode (SHE) at 25°C?
0.00 V
ExplanationThe standard electrode potential of SHE at 25°C is 0.00 V.
#12
Which of the following is an example of a non-spontaneous redox reaction?
Electrolysis of water (H₂O)
ExplanationElectrolysis of water requires an external source of energy to drive the non-spontaneous redox process.
#13
In a galvanic cell, where does oxidation occur?
Anode
ExplanationOxidation occurs at the anode, where electrons are lost.
#14
What is the Nernst equation used for?
To calculate cell potential under non-standard conditions
ExplanationThe Nernst equation calculates cell potential under non-standard conditions.
#15
What is the function of a salt bridge in an electrochemical cell?
To allow ions to move between half-cells
ExplanationA salt bridge facilitates the flow of ions to maintain electrical neutrality in the half-cells.
#16
In a voltaic cell, what drives the flow of electrons through the external circuit?
Oxidation at the anode
ExplanationOxidation at the anode generates electrons, which flow through the external circuit.
#17
What is the function of the porous barrier in a fuel cell?
To allow the flow of ions while blocking the flow of electrons
ExplanationThe porous barrier in a fuel cell permits ion flow while preventing the mixing of oxidant and fuel.