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Online Chemistry MCQs with Answers

Chemistry MCQs play a crucial role in the initial tests for various branches of the Pakistan Army, Navy, and Air Force (PAF), including the Short Service Commission (SSC), Army Electrical and Mechanical Engineering (EME), Education Branch, Weapon Engineering Branch, PN Cadet, SSG, Sailors, and Navy Civilian jobs. The given online Chemistry MCQs are most helpful for the Sailors and Civilian, but overall for basics concepts of Commission tests also.

Over the years, candidates who have successfully cleared these tests have emphasized the importance of mastering chemistry MCQs to secure high marks. These MCQs are designed to test fundamental concepts in chemistry, such as atomic structure, chemical bonding, periodic table trends, acids and bases, and organic chemistry. By focusing on these areas, candidates can build a strong foundation and improve their chances of success.

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Chemistry Tests Quiz (Matric Level)

1 / 25

The atom providing lone pair of electrons in dative covalent bond is called:-

acceptor

electronegative

ionic bond

donor

2 / 25

The sulpher dioxide is used to manufacture :

Nitrogenous fertilizer

Sulphuric dioxide

Ammonia

Sulphuric acid

3 / 25

If Qc =Kc then reaction will be:-

occur from right to left

occur from left to right

irreversible reaction

rates are equal

4 / 25

Ammonia is used to manufacture :

Nitrogenous fertilizer

Hydrogen

Sulphuric acid

Non of these

5 / 25

Petroleum fractions having composition C1-C4 is called:-

kerosene oil

petroleum gas

petroleum ether

petrol

6 / 25

When U.325 break up, it produces:

non of these

Protons

Electrons

Neutrons

7 / 25

The compound having at least one benzene ring are called

alkyne

Aromatic

Alkene

Alkane

8 / 25

All of the following are tri-atomic molecules except:

CO₂

H₂O

O₃

9 / 25

Which one is used as reducing agent

Coal gas

Coal tar

Ammoniac liquor

coke

10 / 25

Which element has the least value of electronegativity

Carbon

Beryllium

boron

Lithium

11 / 25

“N” Shell can accommodate electrons:

12 / 25

The reaction In which all the reactant have been converted to product are known as:

Non of them

Incomplete reaction

Complete reaction

Continuous reaction

13 / 25

the harmful substance present in air are called

water

Carbon dioxide

Ozone

Air pollutant

14 / 25

An active mass is considered as the molar concentrations in units of :

Mole -3dm

Mole -2dm

Mole dm-3

Mole -4dm

15 / 25

How many elements are present in the 3rd period?

16 / 25

Building are being damaged by acid rain because it attack

Calcium sulphate

Calcium nitrate

Calcium carbonate

Calcium oxelte

17 / 25

PAM is the abbreviation of

Poly alkyl nitrate

Per hydroxyl acetyl nitrate

Poly hydroxyl acetyl nitrate

Per hydroxyle acetyl nitrate

18 / 25

Acid rain affects the aquatic life by clogging fish gills because of_________ metal:-

chromium

aluminium

mercury

lead

19 / 25

The most abundant element occurring in the ocean is:

Oxygen

Hydrogen

Silicon

Nitrogen

20 / 25

Which is Lavoisier acid:-

CO2

HCl

H2SO4

NH3

21 / 25

Which one of the following halogen has highest electronegativity?

Bromine

chlorine

Lodine

Fluorine

22 / 25

Atomic number of an element is represented by a symbol:

23 / 25

In the beginning of chemical reaction the rate of forward reaction is fast because of:-

concentration of reactants is large

reactants are in low amount

products are in large amount

products are in low amount

24 / 25

The class formula of tertiary alcohol, is:-

R2CH-OH

R-O-R

R-CH2-OH

R3C-OH

25 / 25

Mono saccharides are _____ sugars.

Normal

Complex

Simplest

Non of these

Your score is

The average score is 37%

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More Important Chemistry MCQs Solved Past Experiences

1. Which of the following is the lightest element?

A) Hydrogen
B) Helium
C) Oxygen
D) Carbon
Answer: A) Hydrogen
Explanation: Hydrogen is the lightest element with an atomic mass of 1.

2. What is the chemical formula of water?

A) CO₂
B) H₂O
C) O₂
D) H₂
Answer: B) H₂O
Explanation: Water is composed of two hydrogen atoms and one oxygen atom.

3. Which gas is most abundant in the Earth’s atmosphere?

A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Argon
Answer: C) Nitrogen
Explanation: Nitrogen makes up about 78% of the Earth’s atmosphere.

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

A) 0
B) 7
C) 14
D) 10
Answer: B) 7
Explanation: A pH of 7 is considered neutral, as in pure water.

5. Which of the following is a noble gas?

A) Oxygen
B) Nitrogen
C) Argon
D) Chlorine
Answer: C) Argon
Explanation: Argon is a noble gas, which is inert and does not react easily with other elements.

6. What is the atomic number of carbon?

A) 6
B) 12
C) 14
D) 8
Answer: A) 6
Explanation: Carbon has 6 protons, so its atomic number is 6.

7. Which of the following is a strong acid?

A) Acetic acid
B) Hydrochloric acid
C) Citric acid
D) Carbonic acid
Answer: B) Hydrochloric acid
Explanation: Hydrochloric acid (HCl) is a strong acid that completely dissociates in water.

8. What is the chemical formula of table salt?

A) NaCl
B) KCl
C) CaCl₂
D) MgCl₂
Answer: A) NaCl
Explanation: Table salt is sodium chloride (NaCl).

9. Which element is essential for combustion?

A) Nitrogen
B) Oxygen
C) Carbon dioxide
D) Hydrogen
Answer: B) Oxygen
Explanation: Oxygen supports combustion, allowing substances to burn.

10. What is the main component of natural gas?

A) Methane
B) Ethane
C) Propane
D) Butane
Answer: A) Methane
Explanation: Natural gas primarily consists of methane (CH₄).

11. Which of the following is a greenhouse gas?

A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Argon
Answer: C) Carbon dioxide
Explanation: Carbon dioxide traps heat in the atmosphere, contributing to the greenhouse effect.

12. What is the chemical symbol for gold?

A) Ag
B) Au
C) Fe
D) Cu
Answer: B) Au
Explanation: The chemical symbol for gold is Au, derived from its Latin name “Aurum.”

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

A) Iron
B) Sodium
C) Sulfur
D) Calcium
Answer: C) Sulfur
Explanation: Sulfur is a non-metal, while the others are metals.

14. What is the formula for sulfuric acid?

A) H₂SO₄
B) HCl
C) HNO₃
D) H₃PO₄
Answer: A) H₂SO₄
Explanation: Sulfuric acid is a strong acid with the formula H₂SO₄.

15. Which gas is used in balloons to make them float?

A) Oxygen
B) Hydrogen
C) Helium
D) Nitrogen
Answer: C) Helium
Explanation: Helium is lighter than air, making it ideal for filling balloons.

16. What is the chemical formula of glucose?

A) C₆H₁₂O₆
B) C₁₂H₂₂O₁₁
C) C₂H₅OH
D) CH₄
Answer: A) C₆H₁₂O₆
Explanation: Glucose is a simple sugar with the formula C₆H₁₂O₆.

17. Which of the following is a halogen?

A) Sodium
B) Chlorine
C) Calcium
D) Magnesium
Answer: B) Chlorine
Explanation: Chlorine is a halogen, found in Group 17 of the periodic table.

18. What is the chemical formula of methane?

A) CH₄
B) C₂H₆
C) C₃H₈
D) C₄H₁₀
Answer: A) CH₄
Explanation: Methane is the simplest hydrocarbon with the formula CH₄.

19. Which of the following is a strong base?

A) Sodium hydroxide
B) Ammonia
C) Water
D) Acetic acid
Answer: A) Sodium hydroxide
Explanation: Sodium hydroxide (NaOH) is a strong base that dissociates completely in water.

20. What is the chemical formula of ammonia?

A) NH₃
B) NO₂
C) N₂O
D) HNO₃
Answer: A) NH₃
Explanation: Ammonia is a compound of nitrogen and hydrogen with the formula NH₃.

21. Which of the following is used as a refrigerant?

A) Oxygen
B) Nitrogen
C) Chlorofluorocarbons (CFCs)
D) Carbon dioxide
Answer: C) Chlorofluorocarbons (CFCs)
Explanation: CFCs were commonly used as refrigerants, though their use is now restricted due to environmental concerns.

22. What is the chemical formula of carbon dioxide?

A) CO
B) CO₂
C) C₂O
D) C₂O₂
Answer: B) CO₂
Explanation: Carbon dioxide consists of one carbon atom and two oxygen atoms.

23. Which of the following is a transition metal?

A) Sodium
B) Iron
C) Calcium
D) Aluminum
Answer: B) Iron
Explanation: Iron is a transition metal, found in the d-block of the periodic table.

24. What is the chemical formula of ozone?

A) O₂
B) O₃
C) O₄
D) O
Answer: B) O₃
Explanation: Ozone is a molecule composed of three oxygen atoms.

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

A) Turn blue litmus red
B) Turn red litmus blue
C) Have a pH greater than 7
D) Are slippery to touch
Answer: A) Turn blue litmus red
Explanation: Acids turn blue litmus paper red and have a pH less than 7.

More Past Experiences of Chemistry MCQs with Answers

26. What is the chemical formula of common salt?

A) NaCl
B) KCl
C) CaCl₂
D) MgCl₂
Answer: A) NaCl
Explanation: Common salt is sodium chloride (NaCl).

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

A) Sour taste
B) Turn red litmus blue
C) Have a pH less than 7
D) React with metals to produce hydrogen gas
Answer: B) Turn red litmus blue
Explanation: Bases turn red litmus paper blue and have a pH greater than 7.

28. What is the chemical formula of methane?

A) CH₄
B) C₂H₆
C) C₃H₈
D) C₄H₁₀
Answer: A) CH₄
Explanation: Methane is the simplest hydrocarbon with the formula CH₄.

29. Which of the following is a strong acid?

A) Acetic acid
B) Hydrochloric acid
C) Citric acid
D) Carbonic acid
Answer: B) Hydrochloric acid
Explanation: Hydrochloric acid (HCl) is a strong acid that completely dissociates in water.

30. What is the chemical formula of sulfuric acid?

A) H₂SO₄
B) HCl
C) HNO₃
D) H₃PO₄
Answer: A) H₂SO₄
Explanation: Sulfuric acid is a strong acid with the formula H₂SO₄.

31. Which of the following is a noble gas?

A) Oxygen
B) Nitrogen
C) Argon
D) Chlorine
Answer: C) Argon
Explanation: Argon is a noble gas, which is inert and does not react easily with other elements.

32. What is the chemical formula of carbon dioxide?

A) CO
B) CO₂
C) C₂O
D) C₂O₂
Answer: B) CO₂
Explanation: Carbon dioxide consists of one carbon atom and two oxygen atoms.

33. Which of the following is a transition metal?

A) Sodium
B) Iron
C) Calcium
D) Aluminum
Answer: B) Iron
Explanation: Iron is a transition metal, found in the d-block of the periodic table.

34. What is the chemical formula of ozone?

A) O₂
B) O₃
C) O₄
D) O
Answer: B) O₃
Explanation: Ozone is a molecule composed of three oxygen atoms.

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

A) Turn blue litmus red
B) Turn red litmus blue
C) Have a pH greater than 7
D) Are slippery to touch
Answer: A) Turn blue litmus red
Explanation: Acids turn blue litmus paper red and have a pH less than 7.

36. What is the chemical formula of ammonia?

A) NH₃
B) NO₂
C) N₂O
D) HNO₃
Answer: A) NH₃
Explanation: Ammonia is a compound of nitrogen and hydrogen with the formula NH₃.

37. Which of the following is used as a refrigerant?

A) Oxygen
B) Nitrogen
C) Chlorofluorocarbons (CFCs)
D) Carbon dioxide
Answer: C) Chlorofluorocarbons (CFCs)
Explanation: CFCs were commonly used as refrigerants, though their use is now restricted due to environmental concerns.

38. What is the chemical formula of glucose?

A) C₆H₁₂O₆
B) C₁₂H₂₂O₁₁
C) C₂H₅OH
D) CH₄
Answer: A) C₆H₁₂O₆
Explanation: Glucose is a simple sugar with the formula C₆H₁₂O₆.

39. Which of the following is a halogen?

A) Sodium
B) Chlorine
C) Calcium
D) Magnesium
Answer: B) Chlorine
Explanation: Chlorine is a halogen, found in Group 17 of the periodic table.

40. What is the chemical formula of methane?

A) CH₄
B) C₂H₆
C) C₃H₈
D) C₄H₁₀
Answer: A) CH₄
Explanation: Methane is the simplest hydrocarbon with the formula CH₄.

41. Which of the following is a strong base?

A) Sodium hydroxide
B) Ammonia
C) Water
D) Acetic acid
Answer: A) Sodium hydroxide
Explanation: Sodium hydroxide (NaOH) is a strong base that dissociates completely in water.

42. What is the chemical formula of ammonia?

A) NH₃
B) NO₂
C) N₂O
D) HNO₃
Answer: A) NH₃
Explanation: Ammonia is a compound of nitrogen and hydrogen with the formula NH₃.

43. Which of the following is used as a refrigerant?

A) Oxygen
B) Nitrogen
C) Chlorofluorocarbons (CFCs)
D) Carbon dioxide
Answer: C) Chlorofluorocarbons (CFCs)
Explanation: CFCs were commonly used as refrigerants, though their use is now restricted due to environmental concerns.

44. What is the chemical formula of glucose?

A) C₆H₁₂O₆
B) C₁₂H₂₂O₁₁
C) C₂H₅OH
D) CH₄
Answer: A) C₆H₁₂O₆
Explanation: Glucose is a simple sugar with the formula C₆H₁₂O₆.

45. Which of the following is a halogen?

A) Sodium
B) Chlorine
C) Calcium
D) Magnesium
Answer: B) Chlorine
Explanation: Chlorine is a halogen, found in Group 17 of the periodic table.

46. What is the chemical formula of methane?

A) CH₄
B) C₂H₆
C) C₃H₈
D) C₄H₁₀
Answer: A) CH₄
Explanation: Methane is the simplest hydrocarbon with the formula CH₄.

47. Which of the following is a strong base?

A) Sodium hydroxide
B) Ammonia
C) Water
D) Acetic acid
Answer: A) Sodium hydroxide
Explanation: Sodium hydroxide (NaOH) is a strong base that dissociates completely in water.

48. What is the chemical formula of ammonia?

A) NH₃
B) NO₂
C) N₂O
D) HNO₃
Answer: A) NH₃
Explanation: Ammonia is a compound of nitrogen and hydrogen with the formula NH₃.

49. Which of the following is used as a refrigerant?

A) Oxygen
B) Nitrogen
C) Chlorofluorocarbons (CFCs)
D) Carbon dioxide
Answer: C) Chlorofluorocarbons (CFCs)
Explanation: CFCs were commonly used as refrigerants, though their use is now restricted due to environmental concerns.

50. What is the chemical formula of glucose?

A) C₆H₁₂O₆
B) C₁₂H₂₂O₁₁
C) C₂H₅OH
D) CH₄
Answer: A) C₆H₁₂O₆
Explanation: Glucose is a simple sugar with the formula C₆H₁₂O₆.

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