Question 1

1. What is the symbol for the element sodium?

Accepted Answer

Na

Answer

Hg

Answer

Ca

Answer

C

Question 2

2. What is the chemical symbol for gold?

Accepted Answer

Au

Answer

Ag

Answer

Cu

Answer

Pt

Question 3

3. Which subatomic particle has a positive charge?

Accepted Answer

Proton

Answer

Electron

Answer

Neutron

Answer

Photon

Question 4

4. What is the atomic mass of calcium?

Accepted Answer

40.08 amu

Answer

55.85 amu

Answer

35.45 amu

Answer

20.18 amu

Question 5

5. What is the atomic mass of carbon?

Accepted Answer

12.01 amu

Answer

4.00 amu

Answer

15.99 amu

Answer

20.18 amu

Question 6

6. What is the molecular mass of water (H₂O)?

Accepted Answer

18 g/mol

Answer

12 g/mol

Answer

16 g/mol

Answer

20 g/mol

Question 7

7. What is the molecular mass of carbon dioxide (CO₂)?

Accepted Answer

44 g/mol

Answer

36 g/mol

Answer

52 g/mol

Answer

28 g/mol

Question 8

8. What is the molecular mass of methane (CH₄)?

Accepted Answer

16 g/mol

Answer

12 g/mol

Answer

20 g/mol

Answer

18 g/mol

Question 9

9. What is the molecular mass of ammonia (NH₃)?

Accepted Answer

17 g/mol

Answer

20 g/mol

Answer

14 g/mol

Answer

18 g/mol

Question 10

10. What is the molecular mass of ethanol (C₂H₅OH)?

Accepted Answer

46 g/mol

Answer

36 g/mol

Answer

52 g/mol

Answer

56 g/mol

Question 11

11. What is the molecular mass of nitrogen gas (N₂)?

Accepted Answer

28 g/mol

Answer

18 g/mol

Answer

32 g/mol

Answer

14 g/mol

Question 12

12. What is the molecular mass of carbon monoxide (CO)?

Accepted Answer

28 g/mol

Answer

20 g/mol

Answer

24 g/mol

Answer

16 g/mol

Question 13

13. What is the molecular mass of sulfuric acid (H₂SO₄)?

Accepted Answer

98 g/mol

Answer

86 g/mol

Answer

74 g/mol

Answer

110 g/mol

Question 14

14. What is the molecular mass of glucose (C₆H₁2O₆)?

Accepted Answer

180 g/mol

Answer

150 g/mol

Answer

120 g/mol

Answer

210 g/mol

Question 15

15. What is the molecular mass of sodium chloride (NaCl)?

Accepted Answer

58.44 g/mol

Answer

52.00 g/mol

Answer

74.55 g/mol

Answer

40.08 g/mol

Question 16

16. Which of the following is NOT a factor affecting relative molecular mass?

Accepted Answer

Atomic masses of atoms in a molecule

Answer

Number of atoms in a molecule

Answer

Types of atoms in a molecule

Answer

C

Answer

Temperature of the surroundings

Question 17

17. What is the definition of relative molecular mass?

Accepted Answer

The ratio of the average mass of one molecule to one-twelfth of the mass of an atom of carbon-12

Answer

The sum of the masses of all atoms in a compound

Answer

C

Answer

The mass of one mole of a compound

Answer

The mass of one atom in a compound

Question 18

18. What is the formula to calculate the relative molecular mass of a compound?

Accepted Answer

Sum of the atomic masses of all atoms in a molecule

Answer

Atomic mass × number of atoms

Answer

B

Answer

Product of the atomic masses of all atoms in a molecule

Answer

Atomic mass ÷ number of atoms

Question 19

19. What is the percentage composition of oxygen in water (H2O)?

Accepted Answer

88.89%

Answer

50%

Answer

10%

Answer

75%

Question 20

20. What is the percentage composition of carbon in glucose (C6H12O6)?

Accepted Answer

40%

Answer

10%

Answer

20%

Answer

30%

Question 21

21. What is the percentage composition of carbon in methane (CH4)?

Accepted Answer

75%

Answer

10%

Answer

25%

Answer

50%

Question 22

22. What is the percentage composition of nitrogen in ammonia (NH3)?

Accepted Answer

82.35%

Answer

66.67%

Answer

25%

Answer

50%

Question 23

23. What is the percentage composition of sodium (Na) in common salt (NaCl)?

Accepted Answer

39.34%

Answer

75%

Answer

25%

Answer

50%

Question 24

24. What is the percentage composition of hydrogen in ammonia (NH3)?

Accepted Answer

16.67%

Answer

33.33%

Answer

50%

Answer

66.67%

Question 25

25. What is the percentage composition of oxygen in carbon dioxide (CO2)?

Accepted Answer

72.73%

Answer

25%

Answer

66.67%

Answer

50%

Question 26

26. What is the percentage composition of hydrogen in water (H2O)?

Accepted Answer

11.11%

Answer

75%

Answer

50%

Answer

25%

Question 27

27. What is the percentage composition of hydrogen in hydrochloric acid?

Accepted Answer

4

Answer

5

Answer

50

Answer

25

Question 28

28. What is the valency of chlorine?

Accepted Answer

1

Answer

3

Answer

2

Answer

4

Question 29

29. What is the valency of aluminum?

Accepted Answer

3

Answer

2

Answer

4

Answer

1

Question 30

30. What is the valency of magnesium?

Accepted Answer

2

Answer

3

Answer

4

Answer

1

Question 31

31. Which of the following is the definition of atomicity?

Accepted Answer

The number of atoms present in a molecule of a substance.

Answer

The size of an atom.

Answer

The charge of an atom.

Answer

The weight of an atom.

Question 32

32. Which of the following elements has the highest atomicity?

Accepted Answer

Oxygen

Answer

Nitrogen

Answer

Hydrogen

Answer

Carbon

Question 33

33. Which of the following statements is true about atomicity?

Accepted Answer

Atomicity refers to the number of atoms present in a molecule of a substance.

Answer

Atomicity refers to the charge of an atom.

Answer

Atomicity refers to the size of an atom.

Answer

Atomicity refers to the weight of an atom.

Question 34

34. Which of the following elements has the atomicity of 3?

Accepted Answer

Nitrogen

Answer

Hydrogen

Answer

Carbon

Answer

Oxygen

Question 35

35. Which of the following elements is the most reactive?

Accepted Answer

Fluorine

Answer

Helium

Answer

Argon

Answer

Neon

Question 36

36. Which of the following is NOT a characteristic of an atom?

Accepted Answer

Having a definite shape

Answer

Having subatomic particles

Answer

Having a nucleus

Answer

Having energy levels

Question 37

37. Which of the following elements has the highest atomic number?

Accepted Answer

Uranium

Answer

Platinum

Answer

Silver

Answer

Gold

Question 38

38. Which of the following elements is the smallest?

Accepted Answer

Helium

Answer

Hydrogen

Answer

Oxygen

Answer

Carbon

Question 39

39. Which subatomic particle has a positive charge?

Accepted Answer

Proton

Answer

Electron

Answer

Photon

Answer

Neutron

Question 40

40. Which of the following elements is a halogen?

Accepted Answer

Chlorine

Answer

Magnesium

Answer

Calcium

Answer

Iron

Question 41

41. Which of the following is an example of an acid radical?

Accepted Answer

SO₄²⁻

Answer

H₂O

Answer

CaCO₃

Answer

NaOH

Question 42

42. Which of the following is a basic radical?

Accepted Answer

OH⁻

Answer

HCl

Answer

NH₄⁺

Answer

LiF

Question 43

43. Which of the following is an example of a basic radical?

Accepted Answer

CO₃²⁻

Answer

NaCl

Answer

Br⁻

Answer

H₂SO₄

Question 44

44. Which of the following is a property of acids?

Accepted Answer

They release hydrogen ions (H⁺) in water.

Answer

They have a sour taste.

Answer

They are slippery to touch.

Answer

They release hydroxide ions (OH⁻) in water.

Question 45

45. Which of the following is a property of bases?

Accepted Answer

They release hydroxide ions (OH⁻) in water.

Answer

They release hydrogen ions (H⁺) in water.

Answer

They are corrosive.

Answer

They have a sour taste.

Question 46

46. Which of the following is an example of a basic solution?

Accepted Answer

Ammonia (NH₃)

Answer

Bleach (sodium hypochlorite)

Answer

Lemon juice

Answer

Vinegar (acetic acid)

Question 47

47. Which of the following is an example of an acidic solution?

Accepted Answer

Vinegar (acetic acid)

Answer

Orange juice

Answer

Milk

Answer

Water

Question 48

48. Which of the following substances is considered a strong acid?

Accepted Answer

Hydrochloric acid (HCl)

Answer

Vinegar (acetic acid)

Answer

Citric acid

Answer

Carbonic acid

Question 49

49. Which of the following substances is considered a strong base?

Accepted Answer

Sodium hydroxide (NaOH)

Answer

Sodium chloride (NaCl)

Answer

Water (H2O)

Answer

Ammonia (NH3)

Question 50

50. Which of the following substances is commonly used to neutralize an acidic solution?

Accepted Answer

Sodium bicarbonate

Answer

Hydrogen peroxide

Answer

Ammonium chloride

Answer

Sulfuric acid

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