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Compared to other sections, Chemistry is considered to be the most scoring section. If prepared thoroughly, chemistry can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. The atomic weight of Fe is 56. The weight of Fe deposited from solution by passing 0.6 Faraday of electricity is

•  5.6 g
•  11.2 g
•  22.4 g
•  33.6 g

11.2 g

Q2. Same quantity of current is passed through molten NaCl and molten cryolite containing . If 4.6 g of sodium were liberated in one cell, the mass of aluminium liberated in other cell was

•  0.9 g
•  2.7 g
•  1.8 g
•  3.6 g

1.8 g

Q3. Silver is removed electrically from 200 ml of a 0.1 N solution of by a current of 0.1 Ampere. How long will it take to remove half of the silver from the solution

•  16 sec
•  96.5 sec
•  100 sec
•  10 sec

96.5 sec

Q4. When an electric current is passed through acidified water. 112 ml of hydrogen gas at NTP is collected at the cathode in 965 seconds. The current passed in Amperes, is

•  1.0
•  0.5
•  0.1
•  2.0

0.5

Q5. How many atoms of calcium will be deposited from a solution of by a current of 25 milliamperes flowing for 60 seconds?

•  4.68×1018
•  4.68×1015
•  4.68×1012
•  4.68×109

4.68×1018

Q6. What is the amount of chlorine evolved when 2 Amperes of current is passed for 30 minutes in an aqueous solution of NaCl?

•  66 g
•  1.32 g
•  33 g
•  99 g

1.32 g

Q7. If 0.5 Amp current is passed through acidified silver nitrate solution for 10 minutes. The mass of silver deposited on cathode, is (eq. wt. of silver nitrate = 108)

•  0.235 g
•  0.336 g
•  0.536 g
•  0.636 g

0.336 g

Q8. If a steady current of 15.0 A is passed through an aqueous solution of , how many minute will it take to deposit 0.250 mol of CuSO4 at the cathode, assuming 100% efficiency

•  3.217×103
•  1.613×103
•  53.62
•  0.893

53.62

Q9. A solution of a salt of a metal was electrolysed for 150 minutes with a current of 0.15 Amperes. The weight of metal deposited was 0.783 gm. The equivalent weight of the metal is

•  55.67 gm
•  65.97 gm
•  75.97 gm
•  85.97 gm

55.67 gm

Q10. On passing a current through KCl solution, 19.5 g of potassium is deposited. If the same quantity of electricity is passed through a solution of aluminium chloride, the amount of aluminium deposited is

•  4.5 g
•  9.0 g
•  13.5 g
•  27 g

4.5 g

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