Set of Chemistry CEE-3
Posted by Set of Chemistry CEE-3
1. Which of the following represents the correct order of increasing atomic radius?
a) F < Cl < Br < I
b) I < Br < Cl < F
c) F < I < Cl < Br
d) I < F < Br < Cl
2. What is the molecular geometry of the H2O molecule?
a) Linear
b) Bent
c) Tetrahedral
d) Trigonal planar
3. Which of the following compounds is a Lewis acid?
a) H2O
b) BF3
c) NH3
d) CH4
4. What is the oxidation state of sulfur in H2SO4?
a) +6
b) +4
c) -2
d) 0
5. The atomic number of an element is determined by the number of:
a) Neutrons
b) Electrons
c) Protons
d) Nucleus
6. The most reactive group in the periodic table is:
a) Noble gases
b) Alkali metals
c) Alkaline earth metals
d) Halogens
7. The chemical formula for magnesium hydroxide is:
a) Mg(OH)2
b) MgOH
c) Mg2(OH)3
d) MgO
8. Which of the following is an example of an allotrope of oxygen?
a) Ozone
b) Nitrogen
c) Carbon dioxide
d) Water
9. Which of the following is a non-metal oxide?
a) Na2O
b) CaO
c) SO2
d) Fe2O3
10. The ionization energy generally increases across a period because:
a) The number of protons increases
b) The atomic radius decreases
c) The number of electrons decreases
d) The electron shielding increases
11. Which of the following elements has the largest ionization energy?
a) Sodium
b) Magnesium
c) Chlorine
d) Neon
12. What is the pH of a 1 × 10⁻⁷ M HCl solution?
a) 0
b) 7
c) 1
d) 3
13. Which of the following compounds is used in fire extinguishers?
a) Sodium bicarbonate
b) Potassium nitrate
c) Carbon dioxide
d) Ammonium chloride
14. Which of the following is an example of a strong base?
a) NH3
b) NaOH
c) H2SO4
d) CH3COOH
15. Which of the following is an example of a chemical change?
a) Melting ice
b) Dissolving salt in water
c) Burning wood
d) Crushing a can
16. The ideal gas law is expressed as:
a) PV = nRT
b) P = V/T
c) PV = k
d) P = RT/V
17. Which of the following gases is most soluble in water?
a) Nitrogen
b) Oxygen
c) Carbon dioxide
d) Methane
18. What is the number of moles in 22.4 L of an ideal gas at STP?
a) 1 mole
b) 2 moles
c) 22.4 moles
d) 0.5 moles
19. Which of the following is a correct statement about isotopes?
a) Isotopes of an element have the same number of neutrons
b) Isotopes of an element have the same number of protons
c) Isotopes of an element have the same chemical properties
d) All of the above
20. Which of the following compounds is a weak acid?
a) HCl
b) HNO3
c) CH3COOH
d) H2SO4
21. What is the chemical formula for potassium permanganate?
a) KMnO4
b) K2MnO4
c) KMn2O7
d) K2MnO3
22. Which of the following is a property of ionic compounds?
a) They are good conductors of electricity in solid form
b) They have high melting and boiling points
c) They are not soluble in water
d) They do not form crystals
23. What is the formula for copper(II) sulfate?
a) CuSO4
b) Cu2SO4
c) CuS
d) CuSO3
24. Which of the following substances is an example of a polyatomic ion?
a) Na+
b) Cl-
c) OH-
d) Fe3+
25. What is the molar mass of calcium chloride (CaCl2)?
a) 71 g/mol
b) 98 g/mol
c) 142 g/mol
d) 147 g/mol
26. Which of the following is a property of noble gases?
a) They are highly reactive
b) They are colorless, odorless, and tasteless
c) They readily form compounds
d) They are highly conductive
27. Which of the following gases is most commonly used in light bulbs?
a) Neon
b) Helium
c) Argon
d) Oxygen
28. The boiling point of water is highest at:
a) 100°C at 1 atm
b) 0°C at 1 atm
c) 100°C at 2 atm
d) 0°C at 0.5 atm
29. Which of the following elements is in the same group as calcium?
a) Magnesium
b) Sodium
c) Potassium
d) Oxygen
30. Which of the following represents an alkane?
a) CH3OH
b) C2H4
c) C2H6
d) C3H8
31. The reaction between an acid and a base to form salt and water is an example of:
a) Redox reaction
b) Neutralization reaction
c) Combination reaction
d) Decomposition reaction
32. What is the empirical formula for the compound C6H12O6?
a) C6H12O6
b) C3H6O3
c) C2H4O2
d) CH2O
33. Which of the following is an example of an oxidation reaction?
a) 2H2 + O2 → 2H2O
b) NaCl → Na + Cl2
c) H2O → H2 + O2
d) Fe2O3 + 3CO → 2Fe + 3CO2
34. What is the formula for calcium phosphate?
a) CaPO4
b) Ca3(PO4)2
c) Ca2(PO4)3
d) Ca(PO4)3
35. Which of the following is a reducing agent in the reaction 2Fe3+ + 3Zn → 2Fe + 3Zn2+?
a) Fe3+
b) Zn
c) Zn2+
d) Fe
36. Which of the following is a property of gases?
a) They have a definite volume
b) Their molecules are tightly packed
c) They expand to fill the container
d) They are incompressible
37. Which of the following is not a type of nuclear radiation?
a) Alpha radiation
b) Beta radiation
c) Gamma radiation
d) Ultraviolet radiation
38. What is the formula for hydrogen peroxide?
a) H2O2
b) H2O
c) H2O3
d) HO2
39. Which of the following is the most abundant element in the Earth’s atmosphere?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Argon
40. What is the chemical name of Na2CO3?
a) Sodium chloride
b) Sodium carbonate
c) Sodium bicarbonate
d) Sodium hydroxide
41. Which of the following gases has the lowest density at STP?
a) Oxygen
b) Hydrogen
c) Carbon dioxide
d) Nitrogen
42. Which of the following substances is a solid at room temperature?
a) CO2
b) N2
c) H2O
d) Cl2
43. Which of the following reactions is a double displacement reaction?
a) NaOH + HCl → Na
Cl + H2O
b) H2 + Cl2 → 2HCl
c) CaCO3 → CaO + CO2
d) 2Na + Cl2 → 2NaCl
44. Which of the following metals is extracted from its ore by electrolysis?
a) Iron
b) Copper
c) Sodium
d) Zinc
45. The reaction of an alkali metal with water produces:
a) Hydrogen gas
b) Oxygen gas
c) Carbon dioxide
d) Nitrogen gas
46. Which of the following is the most likely oxidation state for chlorine in NaClO3?
a) -1
b) +1
c) +3
d) +5
47. Which of the following molecules has polar bonds but is a nonpolar molecule overall?
a) CO2
b) H2O
c) NH3
d) CH3Cl
48. Which of the following has a trigonal bipyramidal molecular geometry?
a) SF6
b) PCl5
c) NH3
d) XeF4
49. Which of the following is the smallest atom?
a) Na
b) K
c) Cl
d) F
50. What is the main component of the Earth's core?
a) Iron
b) Oxygen
c) Silicon
d) Magnesium
Answer Key:
- b) I < Br < Cl < F
- b) Bent
- b) BF3
- a) +6
- c) Protons
- b) Alkali metals
- a) Mg(OH)2
- a) Ozone
- c) SO2
- b) The atomic radius decreases
- d) Neon
- b) 7
- c) Carbon dioxide
- b) NaOH
- c) Burning wood
- a) PV = nRT
- c) Carbon dioxide
- a) 1 mole
- d) All of the above
- c) CH3COOH
- a) KMnO4
- b) They have high melting and boiling points
- a) CuSO4
- c) OH-
- a) 71 g/mol
- b) They are colorless, odorless, and tasteless
- c) Argon
- a) 100°C at 1 atm
- a) Magnesium
- c) C2H6
- b) Neutralization reaction
- b) C3H6O3
- a) 2H2 + O2 → 2H2O
- b) Ca3(PO4)2
- b) Zn
- c) They expand to fill the container
- d) Ultraviolet radiation
- a) H2O2
- b) Nitrogen
- b) Sodium carbonate
- b) Hydrogen
- c) H2O
- a) NaOH + HCl → NaCl + H2O
- c) Sodium
- a) Hydrogen gas
- d) +5
- a) CO2
- b) PCl5
- d) F
- a) Iron
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