Gce Model Questions Vol1 2018 Chemistry Question 1
Practice objective / multiple choice question 1 from the 2018 Gce Model Questions Vol1 Chemistry examination.
An ore sample weighing 100 g contains 80 g of metal oxide \(X_2O_3\) (molar mass 158 g mol\(^{-1}\)) and 5 g of impurity oxide \(Y_2O_3\) (molar mass 128 g mol\(^{-1}\)); the remaining 15 g is inert gangue. The oxides are reduced with excess carbon according to \[X_2O_3 + 3C \rightarrow 2X + 3CO\] \[2Y_2O_3 + 3C \rightarrow 4Y + 3CO\] where the atomic masses are \(M_X = 55\) g mol\(^{-1}\) and \(M_Y = 40\) g mol\(^{-1}\). After reduction the collected metal is 85 % \(X\) by mass and 15 % \(Y\) by mass. Calculate the mass of pure \(X\) obtained from the 100 g ore.
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This is Gce Model Questions Vol1 2018 Chemistry Question 1. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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