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JAMB Physics 2013 Question 45

Question 45

Conduction through Liquids and Gases

If a current of 2.5A flows through an electrolyte for 3 hours and 1.8g of a substance is deposited, what is the mass of the substance that will be deposited if a current of 4A flows through it for 4.8 hours?

  1. A.2.4g.
  2. B.3.2g.
  3. C.4.6g.
  4. D.4.8g.
Show the answer and explanation

Answer: C (4.6g.)

Explanation

Mass ∝ It. m = 1.8 × (4 × 4.8) ÷ (2.5 × 3) = 1.8 × 19.2 ÷ 7.5 ≈ 4.6 g.