WAEC Chemistry 2010 Objective — Question 29

Question 29 of 49 from the West African Examinations Council (WAEC) Chemistry 2010 Objective paper, with the correct answer and a full explanation.

Which of the following equimolar solutions would have the highest conductivity?

A. A. NH4NO3(aq)
B. B. NaNO3(aq)
C. C. Mg(NO3)2(aq)
D. D. Al(NO3)3(aq)Correct

Explanation

Given equal concentrations, ammonium trioxonitrate (V), NaNO3 and NaCl are normal salts except Al(NO3)3, FeSO4 and NaCl - conductivity increases with the total number and charge of ions produced; Al(NO3)3, releasing Al³⁺ ions with the highest charge, gives the highest conductivity among equimolar solutions.

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