Chemical reactions and periodic classification - Question Bank

1. What is the chemical formula for ammonia?
A) NO2
B) NH3
C) H2O
D) SO2
2. Which family of elements is known for being highly reactive and having one valence electron?
A) Alkaline earth metals
B) Halogens
C) Alkali metals
D) Noble gases
3. What is the atomic number of Neon?
A) 8
B) 9
C) 10
D) 11
4. Which of the following is an example of a single displacement reaction?
A) 2H2 + O2 -> 2H2O
B) Zn + CuSO4 -> ZnSO4 + Cu
C) HCl + NaOH -> NaCl + H2O
D) CaCO3 -> CaO + CO2
5. What is the common name for the compound CH4?
A) Ethane
B) Propane
C) Methane
D) Butane
6. Which element has the symbol 'Au'?
A) Silver
B) Aluminum
C) Gold
D) Argon
7. What is the process where a solid directly changes into a gas?
A) Melting
B) Evaporation
C) Sublimation
D) Condensation
8. Which element is a metalloid?
A) Sodium
B) Iron
C) Silicon
D) Sulfur
9. What is the atomic number of Oxygen?
A) 6
B) 7
C) 8
D) 9
10. Which of the following is an endothermic reaction?
A) Combustion of wood
B) Respiration
C) Photosynthesis
D) Explosion of dynamite
11. What is the chemical formula for calcium carbonate?
A) CaCO
B) Ca(CO3)2
C) CaCO3
D) Ca2CO3
12. Which group contains the halogens?
A) Group 1
B) Group 2
C) Group 16
D) Group 17
13. The tendency of an atom to attract a bonding pair of electrons is called:
A) Ionization energy
B) Electron affinity
C) Electronegativity
D) Metallic character
14. What is the symbol for the element Silver?
A) Si
B) Ag
C) Au
D) Ar
15. Which of the following is a non-metal that exists as a diatomic molecule?
A) Sulfur
B) Phosphorus
C) Nitrogen
D) Carbon
16. What is the valency of Chlorine in HCl?
A) 0
B) 1
C) 2
D) 3
17. Which type of reaction involves the transfer of ions between two compounds?
A) Combination
B) Decomposition
C) Single displacement
D) Double displacement
18. What is the common name for the compound C6H12O6?
A) Sucrose
B) Glucose
C) Lactose
D) Fructose
19. Which element is in Group 17 and Period 3?
A) Fluorine
B) Chlorine
C) Bromine
D) Iodine
20. A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change is called a(n):
A) Inhibitor
B) Catalyst
C) Reactant
D) Product
21. What is the chemical formula for sulfuric acid?
A) H2SO3
B) H2SO4
C) HNO3
D) HCl
22. Which of the following is a strong acid?
A) Acetic acid
B) Carbonic acid
C) Hydrochloric acid
D) Sulfurous acid
23. What is the atomic number of Sodium?
A) 10
B) 11
C) 12
D) 13
24. Which period does Sodium (Na) belong to in the periodic table?
A) Period 1
B) Period 2
C) Period 3
D) Period 4
25. The process of adding oxygen or removing hydrogen is called:
A) Reduction
B) Oxidation
C) Neutralization
D) Combustion
26. What is the chemical symbol for Potassium?
A) P
B) K
C) Pt
D) Po
27. Which of the following is a characteristic of metals?
A) Dull luster
B) Poor conductors of heat and electricity
C) Tendency to lose electrons
D) High ionization energy
28. What is the atomic mass of Helium?
A) 1.008 amu
B) 4.003 amu
C) 12.011 amu
D) 15.999 amu
29. Which element is known as the 'universal solvent'?
A) Ethanol
B) Acetone
C) Water
D) Methanol
30. What is the state of matter for most elements in Group 18 (noble gases) at room temperature?
A) Solid
B) Liquid
C) Gas
D) Plasma
31. Which noble gas has the highest atomic number?
A) Helium
B) Neon
C) Argon
D) Radon
32. Identify the type of reaction: CuO + H2 -> Cu + H2O
A) Combination
B) Decomposition
C) Redox reaction
D) Neutralization
33. What is the chemical formula for methane?
A) C2H6
B) CH4
C) C3H8
D) CO2
34. Which element is the most electronegative?
A) Oxygen
B) Chlorine
C) Fluorine
D) Nitrogen
35. The horizontal rows in the periodic table are called:
A) Groups
B) Periods
C) Blocks
D) Series
36. What is the IUPAC name for H2O?
A) Dihydrogen monoxide
B) Hydrogen oxide
C) Water
D) Hydroxic acid
37. Which of the following is a redox reaction?
A) HCl + NaOH -> NaCl + H2O
B) CaCO3 -> CaO + CO2
C) 2KClO3 -> 2KCl + 3O2
D) Zn + 2HCl -> ZnCl2 + H2
38. What is the valency of Oxygen in most of its compounds?
A) 1
B) 2
C) 3
D) 4
39. Which element has the electronic configuration 2, 8, 1?
A) Sodium
B) Potassium
C) Lithium
D) Magnesium
40. The vertical columns in the periodic table are called:
A) Periods
B) Groups
C) Series
D) Blocks
41. What is the chemical formula for common salt?
A) KCl
B) NaCl
C) MgCl2
D) CaCO3
42. Which of the following is an example of a decomposition reaction?
A) 2H2 + O2 -> 2H2O
B) Zn + CuSO4 -> ZnSO4 + Cu
C) CaCO3 -> CaO + CO2
D) AgNO3 + NaCl -> AgCl + NaNO3
43. What type of bond is formed between a metal and a non-metal?
A) Covalent bond
B) Ionic bond
C) Metallic bond
D) Hydrogen bond
44. Which group in the periodic table contains the alkali metals?
A) Group 1
B) Group 2
C) Group 17
D) Group 18
45. What is the atomic number of Carbon?
A) 4
B) 5
C) 6
D) 7
46. In the periodic table, elements are arranged in order of increasing:
A) Atomic mass
B) Number of neutrons
C) Atomic number
D) Number of valence electrons
47. Which element is characterized by the symbol 'Fe'?
A) Fluorine
B) Iron
C) Phosphorus
D) Silver
48. Identify the type of chemical reaction: A + B -> AB
A) Decomposition reaction
B) Displacement reaction
C) Combination reaction
D) Double displacement reaction
49. What does the law of conservation of mass state in a chemical reaction?
A) Mass can be created but not destroyed.
B) Mass can be destroyed but not created.
C) Mass is neither created nor destroyed.
D) Mass is proportional to energy.
50. Which of the following is a balanced chemical equation for the synthesis of water from hydrogen and oxygen?
A) H2 + O2 -> H2O
B) 2H2 + O2 -> 2H2O
C) H2 + O -> H2O
D) 2H + O2 -> H2O2
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