JEE CHEMISTRY UNIT 1: SOME BASIC CONCEPTS IN CHEMISTRY
QUIZ NO 2
TOTAL QUESTIONS = 20


1. The density of a 3 M solution of NaCl (molar mass = 58.5 g/mol) is 1.2 g/mL. The molality of the solution is


2. Which of the following statements is incorrect?


3. How many moles of magnesium phosphate, Mg₃(PO₄)₂, will contain 0.25 mole of oxygen atoms?


4. The oxidation number of chromium in K₂Cr₂O₇ is


5. Which of the following is not a postulate of Dalton’s atomic theory?


6. The molality of a solution is expressed as


7. What is the oxidation state of sulfur in H2SO4?


8. Which of the following is a state function?


9. Which of the following statements is true?


10. A balanced chemical equation obeys


11. What is the molality of a solution containing 5.4 g of glucose (molar mass = 180 g/mol) in 100 g of water?


12. What is the mass of one mole of water?


13. What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?


14. The empirical formula of a compound is CH₂O, and its molecular weight is 180 g/mol. The molecular formula is


15. The volume of 0.1 M HCl required to completely neutralize 25 mL of 0.1 M NaOH is


16. The number of moles in 22.4 L of CO2 gas at STP is


17. The mass of one atom of carbon-12 is


18. A solution contains 5% urea (molar mass = 60 g/mol) by mass. The mole fraction of urea in the solution is


19. Which of the following statements is incorrect?


20. Which of the following has the smallest mass?



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