This extensive collection of Chemistry MCQs is crafted to cover a wide range of topics essential for mastering the fundamentals and advanced concepts in chemistry. Encompassing areas such as organic chemistry, inorganic chemistry, physical chemistry, and analytical techniques, these questions are tailored for students preparing for exams, interviews, and competitive assessments. Each question is designed to enhance critical thinking and problem-solving skills while reinforcing key concepts in chemical reactions, stoichiometry, thermodynamics, and laboratory practices.

Who should practice Chemistry MCQs?

Students preparing for chemistry exams, entrance tests, or standardized assessments.
Individuals seeking to strengthen their understanding of key chemical principles and applications.
Candidates preparing for interviews in fields that require chemistry knowledge, such as pharmaceuticals, environmental science, or research.
Professionals looking to refresh their chemistry knowledge for academic or workplace purposes.
Anyone interested in building a solid foundation in chemistry to pursue further studies or careers in science and technology.

1. What is the atomic number of carbon?

a) 6
b) 12
c) 14
d) 16

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2. Which element is the most abundant in the Earth’s atmosphere?

a) Nitrogen
b) Oxygen
c) Carbon
d) Hydrogen

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3. What is the chemical symbol for gold?

a) Au
b) Ag
c) Pt
d) Pb

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4. Which of the following is NOT a noble gas?

a) Helium
b) Neon
c) Argon
d) Nitrogen

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5. What is the chemical formula for water?

a) H2O
b) CO2
c) NH3
d) HCl

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6. What is the pH value of a neutral solution?

a) 0
b) 7
c) 14
d) 10

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7. Which of the following is NOT a primary color?

a) Green
b) Red
c) Blue
d) Yellow

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8. What is the chemical formula for methane?

a) CO2
b) CH4
c) H2O
d) NH3

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9. Which element is the main component of organic compounds?

a) Oxygen
b) Carbon
c) Hydrogen
d) Nitrogen

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10. What is the chemical symbol for iron?

a) Ag
b) Au
c) Fe
d) Cu

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11. What is the chemical formula for sulfuric acid?

a) HCl
b) H2SO4
c) NaOH
d) HNO3

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12. Which gas is produced during photosynthesis?

a) Nitrogen
b) Oxygen
c) Carbon dioxide
d) Hydrogen

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13. What is the chemical formula for carbon dioxide?

a) CO
b) CO2
c) CH4
d) C2H6

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14. What is the chemical symbol for silver?

a) Fe
b) Au
c) Al
d) Ag

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15. Which of the following is a halogen?

a) Sodium
b) Calcium
c) Magnesium
d) Chlorine

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16. What is the chemical formula for hydrogen peroxide?

a) H2O2
b) HCl
c) NaOH
d) NH3

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17. Which element is essential for combustion to occur?

a) Carbon
b) Oxygen
c) Hydrogen
d) Nitrogen

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18. What is the chemical formula for table salt?

a) NaCl
b) CaCl2
c) KCl
d) MgCl2

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19. Which of the following is a noble gas?

a) Sodium
b) Xenon
c) Chlorine
d) Sulfur

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20. What is the chemical symbol for potassium?

a) P
b) K
c) Pb
d) Pt

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21. What is the chemical formula for ammonia?

a) H2O
b) NH3
c) CO2
d) HCl

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22. Which of the following is NOT a greenhouse gas?

a) Carbon dioxide
b) Oxygen
c) Methane
d) Nitrous oxide

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23. What is the chemical symbol for lead?

a) Fe
b) Pb
c) Au
d) Ag

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24. What is the chemical formula for sulfuric acid?

a) H2SO4
b) HCl
c) NaOH
d) HNO3

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25. Which gas is commonly used in balloons for buoyancy?

a) Nitrogen
b) Helium
c) Oxygen
d) Hydrogen

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26. What is the chemical formula for methane?

a) CH4
b) CO2
c) H2O
d) NH3

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27. What is the chemical symbol for sodium?

a) Ca
b) Na
c) Fe
d) K

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28. Which element is present in all organic compounds?

a) Hydrogen
b) Carbon
c) Oxygen
d) Nitrogen

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29. What is the chemical formula for carbon monoxide?

a) CO
b) CO2
c) CH4
d) C2H6

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30. What is the chemical symbol for mercury?

a) Me
b) Hg
c) He
d) Mg

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31. What is the chemical formula for hydrochloric acid?

a) H2SO4
b) HCl
c) HNO3
d) NaOH

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32. Which of the following elements is a metalloid?

a) Silver
b) Sodium
c) Silicon
d) Sulfur

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33. What is the chemical formula for table sugar (sucrose)?

a) H2O
b) CO2
c) C12H22O11
d) CH4

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34. Which of the following is NOT a property of acids?

a) They turn blue litmus paper red
b) They taste sour
c) They release hydrogen gas when reacted with metals
d) They feel slippery to the touch

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35. What is the chemical symbol for calcium?

a) Co
b) Ca
c) Cu
d) C

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36. What is the chemical formula for baking soda?

a) NaHCO3
b) H2SO4
c) NaOH
d) HCl

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37. Which of the following is NOT a greenhouse gas?

a) Oxygen
b) Carbon dioxide
c) Methane
d) Nitrous oxide

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38. What is the chemical formula for vinegar (acetic acid)?

a) H2SO4
b) NaOH
c) CH3COOH
d) HCl

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39. Which of the following elements is a halogen?

a) Fluorine
b) Potassium
c) Aluminum
d) Iron

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40. What is the chemical symbol for phosphorus?

a) P
b) Ph
c) Pb
d) Po

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41. What is the chemical formula for ammonia?

a) NH3
b) H2O
c) CO2
d) HCl

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42. Which of the following is NOT a noble gas?

a) Neon
b) Helium
c) Argon
d) Nitrogen

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43. What is the chemical formula for hydrogen peroxide?

a) H2O2
b) HCl
c) NaOH
d) NH3

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44. What is the chemical symbol for lead?

a) Pb
b) Fe
c) Au
d) Ag

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45. What is the chemical formula for sulfuric acid?

a) H2SO4
b) HCl
c) NaOH
d) HNO3

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46. Which of the following is a noble gas?

a) Xenon
b) Sodium
c) Chlorine
d) Sulfur

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47. What is the chemical symbol for potassium?

a) K
b) P
c) Pb
d) Pt

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48. What is the chemical formula for methane?

a) CH4
b) CO2
c) H2O
d) NH3

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49. What is the chemical formula for sodium chloride?

a) CaCl2
b) NaCl
c) KCl
d) MgCl2

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50. What is the chemical symbol for silver?

a) Ag
b) Au
c) Al
d) Fe

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51. What is the chemical formula for sulfur dioxide?

a) SO2
b) CO2
c) H2O
d) NH3

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52. Which of the following is NOT a greenhouse gas?

a) Oxygen
b) Carbon dioxide
c) Methane
d) Nitrous oxide

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53. What is the chemical symbol for sodium?

a) Ca
b) Na
c) Fe
d) K

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54. Which element is present in all organic compounds?

a) Hydrogen
b) Carbon
c) Oxygen
d) Nitrogen

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55. What is the chemical formula for carbon monoxide?

a) CO
b) CO2
c) CH4
d) C2H6

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56. What is the chemical symbol for mercury?

a) Me
b) Hg
c) He
d) Mg

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57. What is the chemical formula for hydrochloric acid?

a) H2SO4
b) HCl
c) HNO3
d) NaOH

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58. Which of the following elements is a metalloid?

a) Silver
b) Sodium
c) Silicon
d) Sulfur

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59. What is the chemical formula for table sugar (sucrose)?

a) H2O
b) CO2
c) C12H22O11
d) CH4

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60. Which of the following is NOT a property of acids?

a) They turn blue litmus paper red
b) They taste sour
c) They release hydrogen gas when reacted with metals
d) They feel slippery to the touch

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61. What is the chemical symbol for calcium?

a) Co
b) Ca
c) Cu
d) C

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62. What is the chemical formula for baking soda?

a) NaHCO3
b) H2SO4
c) NaOH
d) HCl

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63. Which of the following is NOT a greenhouse gas?

a) Methane
b) Carbon dioxide
c) Oxygen
d) Nitrous oxide

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64. What is the chemical formula for vinegar (acetic acid)?

a) CH3COOH
b) H2SO4
c) NaOH
d) HCl

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65. Which of the following elements is a halogen?

a) Fluorine
b) Potassium
c) Aluminum
d) Iron

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66. What is the chemical formula for hydrogen peroxide?

a) H2O2
b) HCl
c) NaOH
d) NH3

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67. What is the chemical symbol for lead?

a) Fe
b) Pb
c) Au
d) Ag

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68. What is the chemical formula for sulfuric acid?

a) H2SO4
b) HCl
c) NaOH
d) HNO3

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69. Which of the following is a noble gas?

a) Xenon
b) Sodium
c) Chlorine
d) Sulfur

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70. What is the chemical symbol for potassium?

a) K
b) P
c) Pb
d) Pt

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71. What is the chemical symbol for platinum?

a) Pt
b) Pd
c) Pl
d) Pu

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72. What is the most abundant gas in the Earth’s crust?

a) Oxygen
b) Silicon
c) Aluminum
d) Iron

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73. What is the chemical formula for nitric acid?

a) HNO3
b) H2SO4
c) HCl
d) CH3COOH

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74. Which of the following elements is a transition metal?

a) Sodium
b) Zinc
c) Calcium
d) Phosphorus

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75. What is the chemical symbol for potassium?

a) K
b) Po
c) P
d) Pr

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76. What type of bond is formed when two atoms share electrons?

a) Ionic bond
b) Covalent bond
c) Metallic bond
d) Hydrogen bond

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77. Which of the following is an example of a compound?

a) Hydrogen
b) Oxygen
c) Carbon dioxide
d) Nitrogen

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78. What is the chemical formula for sodium bicarbonate?

a) NaHCO3
b) NaCl
c) Na2CO3
d) NaOH

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79. Which of the following elements is a lanthanide?

a) Thorium
b) Uranium
c) Lanthanum
d) Neodymium

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80. What is the main component of natural gas?

a) Ethane
b) Methane
c) Propane
d) Butane

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