Given E°(Mg²⁺/Mg) = −2.37 V and E°(Ag⁺/Ag) = +0.80 V, what is the standard emf of a cell made from these two electrodes?
Correct answer B. 3.17 V
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Electrochemistry MCQs
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In a galvanic (voltaic) cell, which statement about the anode is correct?
Correct answer B. Oxidation occurs there and it is the negative electrode
In an electrolytic cell, the cathode is the electrode ____.
Correct answer C. connected to the negative terminal of the battery, where reduction occurs
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Which description correctly matches the standard hydrogen electrode?
Correct answer A. Platinised platinum in 1 mol dm⁻³ H⁺, with H₂ gas at 1 atm and 298 K
What is the standard electrode potential assigned to the standard hydrogen electrode?
Correct answer B. 0.00 V
Given E°(Zn²⁺/Zn) = −0.76 V and E°(Cu²⁺/Cu) = +0.34 V, what is the standard emf of the Daniell cell?
Correct answer B. 1.10 V
Given E°(Ag⁺/Ag) = +0.80 V and E°(Cu²⁺/Cu) = +0.34 V, what is E°cell for Cu(s) + 2Ag⁺(aq) → Cu²⁺(aq) + 2Ag(s)?
Correct answer D. 0.46 V
Which halogen is the strongest oxidising agent?
Correct answer D. F₂
Which metal does NOT liberate hydrogen gas from dilute hydrochloric acid?
Correct answer C. Copper
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What is the main function of a salt bridge in a galvanic cell?
Correct answer C. It completes the internal circuit and keeps both solutions electrically neutral
In Cl₂ + 2NaOH → NaCl + NaOCl + H₂O, how do the oxidation numbers of chlorine change?
Correct answer C. From 0 to −1 and from 0 to +1
In terms of oxidation number, what happens to a species that is oxidised?
Correct answer B. Its oxidation number increases
When the equation Cu + HNO₃ → Cu(NO₃)₂ + NO + H₂O (dilute acid) is balanced with the smallest whole numbers, what is the coefficient of HNO₃?
Correct answer A. 8
In acidic solution Cr₂O₇²⁻ oxidises Fe²⁺ to Fe³⁺ and is reduced to Cr³⁺. How many Fe²⁺ ions react with one Cr₂O₇²⁻ ion?
Correct answer A. 6
When acidified MnO₄⁻ oxidises Fe²⁺ to Fe³⁺ (MnO₄⁻ being reduced to Mn²⁺), what is the mole ratio Fe²⁺ : MnO₄⁻ in the balanced equation?
Correct answer C. 5 : 1
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In the reaction Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s), which species is the oxidising agent?
Correct answer B. Cu²⁺
What is the oxidation number of oxygen in oxygen difluoride, OF₂?
Correct answer C. +2
What is the average oxidation number of sulphur in sodium thiosulphate, Na₂S₂O₃?
Correct answer D. +2
What is the oxidation number of chromium in K₂Cr₂O₇?
Correct answer B. +6
What is the oxidation number of manganese in KMnO₄?
Correct answer B. +7