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Electrolysis - Chemistry Jamb Past Questions and Answers

Chemistry Questions And Answers On Electrolysis
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Chemistry Jamb Past Questions


Questions and Answers on Electrolysis

Question 51 :



The soil around a battery manufacturing factory is likely to contain a high concentration of?

A. Ca2+ salts
B. Pb2+ salts
C. Mg2+ salts
D. Al3+ salts


Question 52 :



Mg2+(aq) + 2e->(aq) → Mg(s)(volts) = 2.370
Zn2+(aq) + 2e->(aq) → Zn(s)(volts) = -0.763
Cds2+(aq) + 2e->(aq) → Cd(s)(volts) = 0.403
Cu2+(aq) + 2e->(aq) → Cu(s)(volts) = 0.340
In the electrochemical series above, the strongest reducing agents is?

A. Cu (s)
B. Cd(s)
C. Znsub>(s)
D. Mg(s)


Question 53 :



200cm3 each of 0.1M solutions of lead (II) trioxonitrate (V) and hydrochloric acid were mixed. Assuming that lead (II) chloride is completely insoluble, calculate the mass of lead (II) chloride that will be precipitated.
[Pb = 207, Cl= 35.5, N = 14, O = 16]

A. 2.78g
B. 5.56g
C. 8.34g
D. 11.12g


Question 54 :



What quantity of electricity will liberate 0.125 mole of oxygen molecules during the electrolysis of dilute sodium chloride solution?
[ F = 96 5000 C mol-1 ]

A. 24 125 coulombs
B. 48 250 coulombs
C. 72 375 coulombs
D. 96 500 coulombs


Question 55 :



When a current I was passed through an electrolyte solution for 40 minutes, a mass X g of a univalent metal was deposited at the cathode. What mass of the metal will be deposited when a current 2I is passed through the solution for 10 minutes?

A. X/4 g
B. X/2 g
C. 2X g
D. 4X g






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