12th Science Chemistry 50 MCQ with answer

here are 50 multiple-choice questions (MCQs) in chemistry for 12th standard students along with options and answers :

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

   A) Sodium

   B) Carbon

   C) Fluorine

   D) Potassium

   Answer: C) Fluorine

2. What is the formula of sodium chloride?

   A) NaCl

   B) Na2Cl

   C) NaCl2

   D) Na2Cl2

   Answer: A) NaCl

3. What is the chemical symbol for gold?

   A) Au

   B) Ag

   C) Al

   D) Fe

   Answer: A) Au

4. Which of the following is a noble gas?

   A) Nitrogen

   B) Oxygen

   C) Helium

   D) Hydrogen

   Answer: C) Helium

5. The process of conversion of a solid into a gas without passing through the liquid state is called:

   A) Sublimation

   B) Evaporation

   C) Condensation

   D) Fusion

   Answer: A) Sublimation

6. Which of the following is a greenhouse gas?

   A) Nitrogen

   B) Oxygen

   C) Carbon dioxide

   D) Hydrogen

   Answer: C) Carbon dioxide

7. The pH value of a neutral solution is:

   A) 0

   B) 7

   C) 14

   D) 10

   Answer: B) 7

8. Which of the following is a transition metal?

   A) Calcium

   B) Iron

   C) Sodium

   D) Potassium

   Answer: B) Iron

9. The chemical formula for water is:

   A) H2O

   B) CO2

   C) CH4

   D) NH3

   Answer: A) H2O

10. Which gas is responsible for the depletion of the ozone layer?

    A) Carbon dioxide

    B) Methane

    C) Chlorofluorocarbons (CFCs)

    D) Oxygen

    Answer: C) Chlorofluorocarbons (CFCs)

11. What is the chemical symbol for iron?

    A) I

    B) Fe

    C) Ir

    D) Au

    Answer: B) Fe

12. Which of the following is a halogen?

    A) Sodium

    B) Chlorine

    C) Calcium

    D) Magnesium

    Answer: B) Chlorine

13. The process of burning a substance in the presence of oxygen is called:

    A) Sublimation

    B) Evaporation

    C) Combustion

    D) Condensation

    Answer: C) Combustion

14. The atomic number of carbon is:

    A) 6

    B) 12

    C) 14

    D) 20

    Answer: A) 6

15. What is the chemical formula for ammonia?

    A) NH3

    B) H2O

    C) CO2

    D) CH4

    Answer: A) NH3

16. Which of the following is an alkali metal?

    A) Lithium

    B) Iron

    C) Copper

    D) Zinc

    Answer: A) Lithium

17. The process of converting a gas into a liquid is called:

    A) Evaporation

    B) Sublimation

    C) Condensation

    D) Fusion

    Answer: C) Condensation

18. Which of the following is a non-metal?

    A) Sodium

    B) Oxygen

    C) Iron

    D) Calcium

    Answer: B) Oxygen

19. The formula for sulfuric acid is:

    A) HCl

    B) H2SO4

    C) HNO3

    D) NaOH

    Answer: B) H2SO4

20. What is the chemical symbol for silver?

    A) Ag

    B) Au

    C) Al

    D) Si

    Answer: A) Ag

21. Which of the following is an example of a polar molecule?

    A) CO2

    B) O2

    C) H2

    D) H2O

    Answer: D) H2O

22. The process of passing an electric current through a liquid to bring about a chemical change is called:

    A) Electrolysis

    B) Ionization

    C) Evaporation

    D) Sublimation

    Answer: A) Electrolysis

23. Which of the following is a metalloid?

    A) Silicon

    B) Aluminum

    C) Sodium

    D) Potassium

    Answer: A) Silicon

24. The chemical formula for table salt is:

    A) NaCl

    B) Na2Cl

    C) NaCl2

    D) Na2Cl2

    Answer: A) NaCl

25. What is the chemical symbol for potassium?

    A) K

    B) P

    C) Ka

    D) Po

    Answer: A) K

26. The process of conversion of a gas into a solid without passing through the liquid state is called:

    A) Sublimation

    B) Evaporation

    C) Condensation

    D) Fusion

    Answer: A) Sublimation

27. Which of the following is a metal?

    A) Chlorine

    B) Calcium

    C) Nitrogen

    D) Oxygen

    Answer: B) Calcium

28. The chemical formula for carbon dioxide is:

    A) CO2

    B) CO

    C) C2O

    D) CO3

    Answer: A) CO2

29. What is the chemical symbol for helium?

    A) He

    B) H

    C) He2

    D) Hy

    Answer: A) He

30. Which of the following is a lanthanide?

    A) Neodymium

    B) Iron

    C) Copper

    D) Zinc

    Answer: A) Neodymium

31. The process of conversion of a liquid into a gas is called:

    A) Sublimation

    B) Evaporation

    C) Condensation

    D) Fusion

    Answer: B) Evaporation

32. Which of the following is a noble gas?

    A) Oxygen

    B) Helium

    C) Nitrogen

    D) Hydrogen

    Answer: B) Helium

33. The pH value of an acidic solution is:

    A) Less than 7

    B) 7

    C) Greater than 7

    D) 10

    Answer: A) Less than 7

34. What is the chemical symbol for copper?

    A) Cu

    B) Co

    C) Ca

    D) Cr

    Answer: A) Cu

35. The atomic number of oxygen is:

    A)

 6

    B) 8

    C) 14

    D) 20

    Answer: B) 8

36. Which of the following is a halogen?

    A) Sodium

    B) Chlorine

    C) Calcium

    D) Magnesium

    Answer: B) Chlorine

37. The process of conversion of a gas into a liquid is called:

    A) Evaporation

    B) Sublimation

    C) Condensation

    D) Fusion

    Answer: C) Condensation

38. Which of the following is a non-metal?

    A) Sodium

    B) Oxygen

    C) Iron

    D) Calcium

    Answer: B) Oxygen

39. The formula for hydrochloric acid is:

    A) HCl

    B) H2SO4

    C) HNO3

    D) NaOH

    Answer: A) HCl

40. What is the chemical symbol for mercury?

    A) Hg

    B) He

    C) Me

    D) Hy

    Answer: A) Hg

41. Which of the following is an example of a polar molecule?

    A) CO2

    B) O2

    C) H2

    D) H2O

    Answer: D) H2O

42. The process of passing an electric current through a liquid to bring about a chemical change is called:

    A) Electrolysis

    B) Ionization

    C) Evaporation

    D) Sublimation

    Answer: A) Electrolysis

43. Which of the following is a metalloid?

    A) Silicon

    B) Aluminum

    C) Sodium

    D) Potassium

    Answer: A) Silicon

44. The chemical formula for table salt is:

    A) NaCl

    B) Na2Cl

    C) NaCl2

    D) Na2Cl2

    Answer: A) NaCl

45. What is the chemical symbol for potassium?

    A) K

    B) P

    C) Ka

    D) Po

    Answer: A) K

46. The process of conversion of a gas into a solid without passing through the liquid state is called:

    A) Sublimation

    B) Evaporation

    C) Condensation

    D) Fusion

    Answer: A) Sublimation

47. Which of the following is a metal?

    A) Chlorine

    B) Calcium

    C) Nitrogen

    D) Oxygen

    Answer: B) Calcium

48. The chemical formula for carbon dioxide is:

    A) CO2

    B) CO

    C) C2O

    D) CO3

    Answer: A) CO2

49. What is the chemical symbol for helium?

    A) He

    B) H

    C) He2

    D) Hy

    Answer: A) He

50. Which of the following is a lanthanide?

    A) Neodymium

    B) Iron

    C) Copper

    D) Zinc

    Answer: A) Neodymium