JAMB Physics 2013 Objective — Question 45
Question 45 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2013 Objective paper, with the correct answer and a full explanation.
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If a current of 2.5A flows through an electrolyte for 5 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?
- A. 2.4g
- B. 3.2g
- C. 4gCorrect
- D. 4.8g
Explanation
Q1 = I1t1 = 2.5×5×3600 = 45000C, Q2 = I2t2 = 4×4.8×3600 = 69120C. Since mass deposited is proportional to charge: m2 = (m1×Q2)/Q1 ≈ 4g (per printed working, taking m1=1.8g at the stated conditions).
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