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2007 USNCO Problem 42

Source:

March 12, 2013
direct proportion

Problem Statement

The mass of metal deposited by the electrolysis of an aqueous solution of metal ions increases in direct proportion to which property?
I. electrolysis current\text{I. electrolysis current} II. electrolysis time\text{II. electrolysis time} III. metal ion charge\text{III. metal ion charge}
<spanclass=′latex−bold′>(A)</span> I only<spanclass=′latex−bold′>(B)</span> III only<spanclass=′latex−bold′>(C)</span> I and II only<spanclass=′latex−bold′>(D)</span> I, II, and III <span class='latex-bold'>(A)</span>\ \text{I only} \qquad<span class='latex-bold'>(B)</span>\ \text{III only} \qquad<span class='latex-bold'>(C)</span>\ \text{I and II only} \qquad<span class='latex-bold'>(D)</span>\ \text{I, II, and III}\qquad
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