Neco 2025 Chemistry Question 28
Practice objective / multiple choice question 28 from the 2025 Neco Chemistry examination.
An alloy consists of two metals, A (atomic mass \(55.8\ \text{g mol}^{-1}\), forming divalent cations) and B (atomic mass \(65.4\ \text{g mol}^{-1}\), forming trivalent cations). A 1.00\,g sample of the alloy is dissolved in excess HCl, and 25.0\,mL of the resulting solution is titrated with 0.200\,M Na\(_2\)CO\(_3\). The titration reaches the endpoint after exactly 100.0\,mL of the carbonate solution has been added. Assuming the precipitates are \(\text{MCO}_3\) for metal A and \(\text{M}_2(\text{CO}_3)_3\) for metal B, determine the mass percent of metal B in the alloy.
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About This Question
This is Neco 2025 Chemistry Question 28. It is one of the objective questions from the 2025 Neco Chemistry examination.
Difficulty level: Hard .
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