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Practice each question, then open the answer or worked solution.
The positive value of the standard electrode potential of Cu2+/Cu indicates
that ____________.
(i) this redox couple is a stronger reducing agent than the H+
/H2 couple.
(ii) this redox couple is a stronger oxidising agent than H+/H2.
(iii) Cu can displace H2 from acid.
(iv) Cu cannot displace H2 from acid.
Option (ii) and (iv) are the answers.
E°Cell for some half cell reactions are given below. Based on these mark
the correct answer.
(a) H+(aq) + e– →1/2H2(g) ; E°cell = 0.00V
(b) 2H2O (l) → O2 (g) + 4H+(aq) + 4e–: E°cell = 1.23V
(c) 2SO42– (aq) → S2O82– (aq) + 2e– ; E°cell = 1.96V
(i) In dilute sulphuric acid solution, hydrogen will be reduced at the cathode.
(ii) In concentrated sulphuric acid solution, water will be oxidised at the anode.
(iii) In dilute sulphuric acid solution, water will be oxidised at the anode.
(iv) In dilute sulphuric acid solution, SO42– ion will be oxidised to tetrathionate ion at the anode.
Option (i) and (iii) are the answers.
E°Cell = 1.1V for Daniel cell. Which of the following expressions are correct description of state of equilibrium in ths cell?
(i) 1.1 = Kc
(ii) 2.303RT/2F logKc = 1.1
(iii) log Kc = 2.2/0.059
(iv) log Kc = 1.1
Option (ii) and (iii) are the answers.
Conductivity of an electrolytic solution depends on ____________.
(i) nature of electrolyte.
(ii) the concentration of electrolyte.
(iii) power of AC source.
(iv) distance between the electrodes.
Option (i) and (ii) are the answers.
˄0m(H2O) is equal to ______________.
(i) ˄0m(HCl) + ˄0m(NaOHl) – ˄0m(NaCl)
(ii) ˄0m(HNO3) + ˄0m(NaNO3) – ˄0m(NaOH)
(iii) ˄0m(HNO3) + ˄0m(NaOH) – ˄0m(NaNO3)
(iv) ˄0m(NH4OH) + ˄0m(HCl) – ˄0m(NH4Cl)
Option (i) and (iii) are the answers.
What will happen during the electrolysis of an aqueous solution of CuSO4 by
using platinum electrodes?
(i) Copper will deposit at the cathode.
(ii) Copper will deposit at the anode.
(iii) Oxygen will be released at anode.
(iv) Copper will dissolve at the anode.
Option (i) and (iii) are the answers.
What will happen during the electrolysis of an aqueous solution of CuSO4 in the
presence of Cu electrodes?
(i) Copper will deposit at the cathode.
(ii) Copper will dissolve at the anode.
(iii) Oxygen will be released at anode.
(iv) Copper will deposit at the anode.
Option (i) and (ii) are the answers
Conductivity κ , is equal to ____________.
(i) 1/R l/A
(ii) G*/R
(iii) ˄m
(iv) l/A
Option (i) and (ii) are the answers.
Molar conductivity of ionic solution depends on ___________.
(i) temperature.
(ii) distance between electrodes.
(iii) the concentration of electrolytes in solution.
(iv) the surface area of electrodes.
Option (i) and (iii) are the answers.
For the given cell, Mg|Mg2+|| Cu2+|Cu
(i) Mg is cathode
(ii) Cu is cathode
(iii) The cell reaction is Mg + Cu2+ → Mg2+ + Cu
(iv) Cu is the oxidising agentSolution:
Option (ii) and (iii) are the answers.
III. Short Answer Type
Solution coming soon.