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
A. 3.0 m
B. 3.5 m
C. 4.0 m
D. 2.5 m
2. Which of the following statements is incorrect?
A. 1 mole of any gas occupies 22.4 L at STP
B. 1 mole of water contains 6.022 × 10²³ molecules
C. 1 mole of electrons weighs 1 gram
D. 1 mole of NaCl contains 6.022 × 10²³ ions
3. How many moles of magnesium phosphate, Mg₃(PO₄)₂, will contain 0.25 mole of oxygen atoms?
A. 0.125
B. 0.015625
C. 0.0625
D. 0.03125
4. The oxidation number of chromium in K₂Cr₂O₇ is
A. +3
B. +7
C. +2
D. +6
5. Which of the following is not a postulate of Dalton’s atomic theory?
A. Atoms of a given element have identical mass and properties
B. Compounds are formed by a combination of atoms
C. Atoms can be created or destroyed in chemical reactions
D. Atoms are indivisible
6. The molality of a solution is expressed as
A. moles of solute per liter of solution
B. moles of solute per liter of solvent
C. grams of solute per kg of solvent
D. moles of solute per kg of solvent
7. What is the oxidation state of sulfur in H2SO4?
A. 0
B. +6
C. +2
D. +4
8. Which of the following is a state function?
A. Energy
B. Heat
C. Enthalpy
D. Work
9. Which of the following statements is true?
A. A mole of oxygen gas weighs 16 g
B. A mole of oxygen atoms weighs 32 g
C. A mole of oxygen gas contains 6.022 × 10²³ molecules
D. A mole of oxygen gas contains 6.022 × 10²³ atoms
10. A balanced chemical equation obeys
A. Boyle's law
B. law of conservation of mass
C. law of constant proportions
D. Avogadro's law
11. What is the molality of a solution containing 5.4 g of glucose (molar mass = 180 g/mol) in 100 g of water?
A. 0.1 m
B. 0.2 m
C. 0.4 m
D. 0.3 m
12. What is the mass of one mole of water?
A. 18 g
B. 16 g
C. 20 g
D. 10 g
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?
A. 89.6 L
B. 22.4 L
C. 67.2 L
D. 44.8 L
14. The empirical formula of a compound is CH₂O, and its molecular weight is 180 g/mol. The molecular formula is
A. C₃H₆O₃
B. C₂H₄O₂
C. C₆H₁₂O₆
D. C₄H₈O₄
15. The volume of 0.1 M HCl required to completely neutralize 25 mL of 0.1 M NaOH is
A. 25 mL
B. 10 mL
C. 50 mL
D. 100 mL
16. The number of moles in 22.4 L of CO2 gas at STP is
A. 2
B. 0.5
C. 1
D. 3
17. The mass of one atom of carbon-12 is
A. 1.992 × 10⁻²³ g
B. 1.602 × 10⁻¹⁹ g
C. 1.660 × 10⁻²⁴ g
D. 12 g
18. A solution contains 5% urea (molar mass = 60 g/mol) by mass. The mole fraction of urea in the solution is
A. 0.250
B. 0.083
C. 0.017
D. 0.125
19. Which of the following statements is incorrect?
A. 1 mole of any gas occupies 22.4 L at STP
B. 1 mole of water contains 6.022 × 10²³ molecules
C. 1 mole of NaCl contains 6.022 × 10²³ ions
D. 1 mole of electrons weighs 1 gram
20. Which of the following has the smallest mass?
A. 1 atom of oxygen
B. 1 atom of carbon
C. 1 atom of nitrogen
D. 1 atom of helium
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