JEE CHEMISTRY UNIT 1: SOME BASIC CONCEPTS IN CHEMISTRY
QUIZ NO 3
TOTAL QUESTIONS = 20


1. If 0.5 moles of BaCl₂ are mixed with 0.2 moles of Na₃PO₄, the maximum number of moles of Ba₃(PO₄)₂ that can be formed is


2. If 1 mole of a gas occupies 22.4 L at STP, what is the volume of 2 moles?


3. The number of significant figures in 0.00250 is


4. Avogadro's number is


5. The mass percentage of oxygen in H2O is approximately


6. The percentage of nitrogen in NH₃ is


7. How many molecules are present in 1 mole of oxygen gas?


8. The number of moles in 44 g of CO₂ is


9. The molarity of a solution containing 5.85 g of NaCl in 500 mL of solution is


10. How many significant figures are there in 0.00420?


11. The atomic mass of an element is equal to


12. An organic compound contains 80% carbon and 20% hydrogen by mass. Its empirical formula is


13. The equivalent weight of H₃PO₄ in the reaction forming H₂PO₄⁻ is


14. For a reaction A + 2B → C, the amount of C formed by starting the reaction with 5 moles of A and 8 moles of B is


15. 100 mL of PH₃ on heating forms P₄ and H₂. The volume change in the reaction is


16. Which of the following has the highest mass percentage of oxygen?


17. What is the molecular formula of a compound with empirical formula CH and molar mass 78 g/mol?


18. A sample of pure compound contains 9 g of aluminum and 35.5 g of chlorine. The empirical formula of the compound is


19. The mass of 112 mL of NH₃ gas at STP is


20. The limiting reagent in the reaction 2H₂ + O₂ → 2H₂O when 4 g of H₂ reacts with 32 g of O₂ is



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