Waec Model Questions Vol1 2017 Chemistry Question 1
Practice objective / multiple choice question 1 from the 2017 Waec Model Questions Vol1 Chemistry examination.
A 10.0 g sample of impure copper metal contains 85% copper and 15% zinc by mass. The sample is treated with dilute nitric acid which dissolves only the zinc, forming Zn(NO₃)₂. The solution is then treated with excess Na₂CO₃ to precipitate ZnCO₃, which is filtered, dried and heated to convert it completely to ZnO (loss of CO₂). After heating, 1.80 g of ZnO is obtained. Calculate the percent recovery of zinc as ZnO based on the original amount of zinc in the impure copper sample. Give your answer to one decimal place.
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About This Question
This is Waec Model Questions Vol1 2017 Chemistry Question 1. It is a objective / multiple choice question from the 2017 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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