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MDCAT - UHS Past Papers - Chemistry - Chap No 1 Quiz

Attempt 10 MCQs on MDCAT - UHS Past Papers - Chemistry - Chap No 1 | Quiz 2

11. A sodium oxide compound has 74.2% Na and 25.8% O. The empirical formula is:



12. A phosphorous oxide has 43.6% oxygen. Its empirical formula is:



13. How many chlorine atoms are in 2 moles of Cl₂?



14. 8 g (4 moles) of H₂ react with 2 moles of O₂. How many moles of water are formed?



15. Hydrogen burns in chlorine to produce HCl. The ratio of masses of reactants in the chemical reaction is: H₂ + Cl₂ → 2HCl



16. The number of molecules in 9g of ice (H₂O) is:



17. How many moles of sodium are present in 0.1g of sodium?



18. The number of moles of CO₂ which contains 8.00g of oxygen is:



19. 3.0 moles of calcium will contain ----g of calcium:



20. During stoichiometric calculations, which of the following laws must be followed?



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