50 Useful NEET Chemistry MCQs with Answer and Explanations

Here are the Questions (MCQs) with Answers and Explanations:

1. Which of the following elements has the highest electronegativity?

• a) Sodium
• b) Chlorine
• c) Carbon
• d) Silicon
• Answer: b) Chlorine
• Explanation: Chlorine has the highest electronegativity among these elements, as it has the strongest tendency to attract electrons. Electronegativity generally increases across periods from left to right in the periodic table.

2. What is the molecular formula of sulfuric acid?

• a) H2SO4
• b) HSO3
• c) H2S2O2
• d) SO4
• Answer: a) H2SO4
• Explanation: Sulfuric acid has the molecular formula H2SO4. It consists of two hydrogen atoms, one sulfur atom, and four oxygen atoms.

3. Which of the following is a noble gas?

• a) Oxygen
• b) Neon
• c) Chlorine
• d) Nitrogen
• Answer: b) Neon
• Explanation: Neon is a noble gas, which means it is chemically inert and does not readily form compounds with other elements.

4. What is the chemical formula for table salt (sodium chloride)?

• a) Na2O
• b) NaCl
• c) Na2CO3
• d) Na2SO4
• Answer: b) NaCl
• Explanation: The chemical formula for table salt, sodium chloride, is NaCl.

5. Which of the following is a hydrocarbon?

• a) H2O
• b) CO2
• c) CH4
• d) NaCl
• Answer: c) CH4
• Explanation: Methane (CH4) is a hydrocarbon, consisting of carbon and hydrogen atoms. It is the simplest alkane.

6. What is the main component of natural gas?

• a) Methane
• b) Ethane
• c) Propane
• d) Butane
• Answer: a) Methane
• Explanation: Methane is the primary component of natural gas and is a hydrocarbon with the chemical formula CH4.

7. Which element is essential for combustion to occur?

• a) Nitrogen
• b) Oxygen
• c) Carbon
• d) Hydrogen
• Answer: b) Oxygen
• Explanation: Oxygen is essential for combustion to occur. It supports the chemical reaction that involves the burning of fuel.

8. What is the chemical formula for glucose, a common sugar?

• a) C6H12O6
• b) C12H22O11
• c) C5H10O5
• d) C6H6O6
• Answer: a) C6H12O6
• Explanation: Glucose has the chemical formula C6H12O6, and it is a simple sugar, also known as a monosaccharide.

9. Which of the following is an example of a halogen element?

• a) Fluorine
• b) Iron
• c) Gold
• d) Silver
• Answer: a) Fluorine
• Explanation: Fluorine is a halogen element and belongs to Group 17 of the periodic table.

10. What is the process of converting a solid directly into a gas without becoming a liquid called?

• a) Condensation
• b) Sublimation
• c) Evaporation
• d) Fusion
• Answer: b) Sublimation
• Explanation: Sublimation is the process in which a substance transitions directly from a solid to a gas without passing through the liquid phase.

11. Question: What is the molecular formula of ammonia?

• a) NH4
• b) N2H3
• c) NH3
• d) NH2
• Answer: c) NH3
• Explanation: The molecular formula of ammonia is NH3, which consists of one nitrogen atom and three hydrogen atoms.

12. Which of the following elements is a noble gas with the atomic number 10?

• a) Neon
• b) Argon
• c) Krypton
• d) Helium
• Answer: a) Neon
• Explanation: Neon is a noble gas with the atomic number 10. It is chemically inert and has a full outer electron shell.

13. In the periodic table, elements in the same group have the same number of what?

• a) Protons
• b) Neutrons
• c) Electrons
• d) Isotopes
• Answer: c) Electrons
• Explanation: Elements in the same group of the periodic table have the same number of valence electrons, which determines their chemical properties.

14. What is the chemical symbol for silver?

• a) Ag
• b) Si
• c) Al
• d) Sr
• Answer: a) Ag
• Explanation: The chemical symbol for silver is Ag, derived from its Latin name, “argentum.”

15. Which of the following is a non-metal element that exists as a diatomic molecule in its natural state?

• a) Hydrogen
• b) Neon
• c) Oxygen
• d) Sodium
• Answer: c) Oxygen
• Explanation: Oxygen exists as a diatomic molecule (O2) in its natural state and is a non-metal element.

16. What is the pH of a neutral solution at 25°C?

• a) 0
• b) 7
• c) 14
• d) 1
• Answer: b) 7
• Explanation: A neutral solution has a pH of 7. The pH scale measures the acidity or basicity of a solution, with 7 being neutral.

17. Which element is the most abundant in Earth’s crust?

• a) Iron
• b) Oxygen
• c) Silicon
• d) Carbon
• Answer: b) Oxygen
• Explanation: Oxygen is the most abundant element in Earth’s crust, comprising about 46% of its mass.

18. What type of reaction occurs when two or more substances combine to form a single product?

• a) Decomposition
• b) Substitution
• c) Combination
• d) Redox
• Answer: c) Combination
• Explanation: A combination reaction is when two or more substances react to form a single product.

19. Which of the following is a non-metal that is a good conductor of electricity?

• a) Carbon
• b) Chlorine
• c) Sulfur
• d) Bromine
• Answer: a) Carbon
• Explanation: Carbon, in the form of graphite, is a non-metal that is a good conductor of electricity due to its structure.

20. What is the chemical formula for hydrogen peroxide?

• a) H2O2
• b) HO2
• c) H2O
• d) H3O
• Answer: a) H2O2
• Explanation: The chemical formula for hydrogen peroxide is H2O2, which consists of two hydrogen and two oxygen atoms.

21. What is the chemical formula for common table sugar, sucrose?

• a) C12H22O11
• b) C6H12O6
• c) C3H6O3
• d) C8H18O4
• Answer: a) C12H22O11
• Explanation: The chemical formula for sucrose, common table sugar, is C12H22O11. It is a disaccharide made up of glucose and fructose.

22. What is the primary function of catalysts in chemical reactions?

• a) Increase reactant concentration
• b) Decrease reaction rate
• c) Lower activation energy
• d) Increase the number of products
• Answer: c) Lower activation energy
• Explanation: Catalysts lower the activation energy required for a chemical reaction, thereby increasing the reaction rate without being consumed in the process.

23. Which gas is responsible for the green color of plants and is essential for photosynthesis?

• a) Oxygen
• b) Carbon dioxide
• c) Nitrogen
• d) Chlorophyll
• Answer: b) Carbon dioxide
• Explanation: Carbon dioxide is essential for photosynthesis in plants and is also responsible for the green color due to the presence of chlorophyll.

24. What is the term for the process in which a substance changes from a gas to a liquid?

• a) Sublimation
• b) Condensation
• c) Vaporization
• d) Evaporation
• Answer: b) Condensation
• Explanation: Condensation is the process in which a substance changes from a gas to a liquid.

25. What is the SI unit for measuring electric current?

• a) Volt
• b) Ohm
• c) Ampere
• d) Watt
• Answer: c) Ampere
• Explanation: The SI unit for measuring electric current is the ampere (A).

26. What is the chemical symbol for gold?

• a) Ag
• b) Au
• c) Fe
• d) Pt
• Answer: b) Au
• Explanation: The chemical symbol for gold is Au, derived from its Latin name, “aurum.”

27. Which of the following is a transition metal commonly used in electrical wiring due to its high conductivity?

• a) Copper
• b) Aluminum
• c) Zinc
• d) Magnesium
• Answer: a) Copper
• Explanation: Copper is a transition metal that is widely used in electrical wiring because of its excellent conductivity.

28. What is the term for the smallest particle of an element that retains its properties?

• a) Molecule
• b) Atom
• c) Ion d) Compound
• Answer: b) Atom
• Explanation: An atom is the smallest particle of an element that retains its chemical properties.

29. Which of the following is a common greenhouse gas in Earth’s atmosphere?

• a) Oxygen
• b) Nitrogen
• c) Carbon dioxide
• d) Argon
• Answer: c) Carbon dioxide
• Explanation: Carbon dioxide is a greenhouse gas that plays a role in the Earth’s climate by trapping heat from the Sun.

30. What is the process by which a substance turns directly from a gas into a solid without becoming a liquid called?

• a) Deposition
• b) Sublimation
• c) Condensation
• d) Precipitation
• Answer: a) Deposition
• Explanation: Deposition is the process in which a substance transitions directly from a gas to a solid without passing through the liquid phase.

31. What is the chemical formula for water?

• a) H2O2
• b) CO2
• c) H2O
• d) O2
• Answer: c) H2O
• Explanation: The chemical formula for water is H2O, which consists of two hydrogen atoms and one oxygen atom.

32. Which of the following elements is a halogen that is commonly used in disinfectants and drinking water purification?

• a) Sodium
• b) Chlorine
• c) Phosphorus
• d) Potassium
• Answer: b) Chlorine
• Explanation: Chlorine, a halogen element, is used in disinfectants and for purifying drinking water due to its germicidal properties.

33. What is the chemical formula for sulfur dioxide, a common air pollutant?

• a) SO2
• b) H2SO4
• c) S2O
• d) H2S2O3
• Answer: a) SO2
• Explanation: The chemical formula for sulfur dioxide is SO2, and it is a common air pollutant produced by the combustion of sulfur-containing fuels.

34. What is the pH of a strong acid, such as hydrochloric acid?

• a) 7
• b) 14
• c) 0 d) 1
• Answer: c) 0
• Explanation: Strong acids have a pH close to 0, indicating high acidity.

35. Which gas is responsible for the “bubbling” in carbonated beverages like soda?

• a) Oxygen
• b) Carbon dioxide
• c) Hydrogen
• d) Nitrogen
• Answer: b) Carbon dioxide
• Explanation: Carbon dioxide is responsible for the effervescence or “bubbling” in carbonated beverages.

36. What is the chemical formula for methane, a primary component of natural gas?

• a) CH4
• b) CO2
• c) C2H4
• d) H2S
• Answer: a) CH4
• Explanation: The chemical formula for methane, a primary component of natural gas, is CH4.

37. Which subatomic particle is found in the nucleus of an atom and carries a positive charge?

• a) Neutron
• b) Electron
• c) Proton
• d) Quark
• Answer: c) Proton
• Explanation: Protons are found in the nucleus of an atom and carry a positive charge.

38. What is the chemical formula for sulfuric acid, a strong acid used in various industries?

• a) H2SO4
• b) H2S2O2
• c) HSO3
• d) H2O2
• Answer: a) H2SO4
• Explanation: The chemical formula for sulfuric acid is H2SO4. It is a strong acid widely used in industries.

39. Which process involves the loss of electrons from an atom or molecule?

• a) Reduction
• b) Oxidation
• c) Sublimation
• d) Combustion
• Answer: b) Oxidation
• Explanation: Oxidation involves the loss of electrons from an atom or molecule.

40. What is the primary gas responsible for the “greenhouse effect” and global warming?

• a) Oxygen
• b) Nitrogen
• c) Carbon dioxide
• d) Methane
• Answer: c) Carbon dioxide
• Explanation: Carbon dioxide (CO2) is the primary gas responsible for the greenhouse effect and global warming due to its ability to trap heat in the Earth’s atmosphere.

41. Which of the following elements is a noble gas and is used in lighting, such as neon signs?

• a) Argon
• b) Krypton
• c) Helium
• d) Neon
• Answer: d) Neon
• Explanation: Neon is a noble gas commonly used in lighting, including neon signs.

42. What is the chemical symbol for potassium?

• a) Pt
• b) K
• c) Po
• d) Pb
• Answer: b) K
• Explanation: The chemical symbol for potassium is K.

43. Which type of bond involves the sharing of electrons between atoms?

• a) Ionic bond
• b) Covalent bond
• c) Metallic bond
• d) Hydrogen bond
• Answer: b) Covalent bond
• Explanation: Covalent bonds involve the sharing of electrons between atoms.

44. What is the process by which a solid changes directly into a gas without becoming a liquid first?

• a) Sublimation
• b) Vaporization
• c) Evaporation
• d) Melting
• Answer: a) Sublimation
• Explanation: Sublimation is the process by which a solid transitions directly into a gas without going through the liquid phase.

45. Which element is the most abundant in the universe and is primarily found in stars?

• a) Hydrogen
• b) Helium
• c) Carbon
• d) Oxygen
• Answer: a) Hydrogen
• Explanation: Hydrogen is the most abundant element in the universe and is a primary constituent of stars.

46. What is the term for a substance that accelerates the rate of a chemical reaction but is not consumed in the process?

• a) Catalyst
• b) Reactant
• c) Product
• d) Inhibitor
• Answer: a) Catalyst
• Explanation: A catalyst is a substance that accelerates the rate of a chemical reaction without being consumed in the reaction.

47. What is the chemical formula for hydrogen sulfide, a colorless, toxic gas with a characteristic “rotten egg” odor?

• a) H2O2
• b) H2S
• c) H2SO4
• d) HS
• Answer: b) H2S
• Explanation: The chemical formula for hydrogen sulfide is H2S.

48. Which of the following subatomic particles carries a negative charge and orbits the nucleus of an atom?

• a) Proton
• b) Electron
• c) Neutron
• d) Quark
• Answer: b) Electron
• Explanation: Electrons carry a negative charge and orbit the nucleus of an atom.

49. Question: What is the chemical symbol for lead, a heavy metal used in various applications, including batteries?

• a) Li
• b) Pb
• c) Pt
• d) Po
• Answer: b) Pb
• Explanation: The chemical symbol for lead is Pb.

50. In a chemical equation, what does the arrow (->) represent?

• a) A reaction that is reversible
• b) The production of heat
• c) The direction of the reaction
• d) The creation of a new element
• Answer: c) The direction of the reaction
• Explanation: In a chemical equation, the arrow (->) indicates the direction in which the reaction proceeds.

We hope that these 50 NEET Chemistry MCQs, along with their detailed explanations, have been a valuable resource to strengthen your knowledge and preparation. Keep practicing and exploring the world of chemistry to excel in your NEET journey. Best of luck!

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