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JAMB Chemistry 2010 Question 25

Question 25

Electrolysis

What quantity of aluminium is deposited when a current of 10A is passed through a solution of an aluminium salt for 1930s? [Al = 27, F = 96 500 C mol−1]

  1. A.0.2 g
  2. B.1.8 g
  3. C.5.4 g
  4. D.14.2 g
Show the answer and explanation

Answer: B (1.8 g)

Explanation

Q = 10 × 1930 = 19 300 C = 0.2 F. Al3+ needs 3 F per mole, so 0.2/3 mol × 27 = 1.8 g.