General Chemistry (Part 7): Faraday's Laws

For XII level students:
The following questions apply Faraday's laws. You can try doing the questions to check how well you've been in this part. Don't forget to prepare yourselves for 3rd monthly exam. Good luck!

1. Potassium chlorate can be made of potassium chloride based on the following equation:
KCl (aq) + 3 H2O (l) → KClO3 (aq) + 3 H2 (g)
How much electric charge will be consumed to form 1 moles of potassium chlorate?
A. 2 Farad
B. 3 Farad
C. 4 Farad
D. 5 Farad
E. 6 Farad

2. Aqueous copper (II) nitrate is electrolyzed by platinum electrodes and found 12.7 grams of precipitation. What volume of a gas around anode will be produced at STP? (Ar Cu = 63.5)
A. 1.12 liters
B. 2.24 liters
C. 3.36 liters
D. 4.48 liters
E. 5.60 liters

3. Amount of electric charge could precipitate 2.7 grams of aluminum (Ar = 27) from its solution. When the same charge of electric is used for an acidic solution, how much hydrogen gas will be produced at 1 atm and 273K?
A. 2.24 liters
B. 3.36 liters
C. 4.48 liters
D. 5.60 liters
E. 6.72 liters

4. What Farad will be needed to reduce 60 grams of calcium ions to metallic substance? (Ar Ca = 40)
A. 1 Farad
B. 1.5 Farad
C. 2 Farad
D. 3 Farad
E. 4 Farad

5. Diluted silver nitrate is electrolyzed by 2 Amperes of electrolytic current for 10 minutes. What mass of silver will be precipitated on cathode? (Ar Ag = 108, 1 F = 96,500)
A. (96,500 x 20) grams
B. (96,500 x 108 x 20) grams
C. (96,500 x 108 x 200) grams
D. [(108 / 96,500) x 20] grams
E. [(108 / 96,500) x 1,200] grams

6. Equal amount of electricity is flown into two electrolytic cells. The first cell uses carbon and zinc as electrodes in aqueous zinc sulfate while the second cell uses carbon and tin as electrodes in aqueous tin (II) chloride. If found that 13 grams of zinc is precipitated in the first cell, how many grams of tin would be found? (Ar Zn = 65, Sn = 119)
A. 0.9 grams
B. 11.9 grams
C. 18.3 grams
D. 71.0 grams
E. 595 grams

7. An electric current was flown into an electrolytic cell which contains silver ions (Ar Ag = 108) and in time period it precipitates 0.54 grams of silver on cathode. If equal electric current was flown in another solution which contains M2+ (Ar M = 40), what mass of M would be precipitated on cathode?
A. 0.54 grams
B. 0.40 grams
C. 0.27 grams
D. 0.20 grams
E. 0.10 grams

8. In an electrolytic process where used the diluted sulfuric acid, produced 2.24 dm3 of hydrogen gas at STP. If equal amount of electric current is flown for aqueous silver nitrate (Ar Ag = 108), how many grams of silver will be formed on cathode?
A. 2.7 grams
B. 5.4 grams
C. 10.8 grams
D. 21.6 grams
E. 43.2 grams