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MCQs of Chemistry with Answers Free Preparation

For those preparing for initial tests in the Pakistan Army, Navy, or PAF, chemistry MCQs are not just a test of knowledge but also a test of analytical and problem-solving skills. Past candidates recommend using reliable resources, such as chemistry MCQ books, online practice tests, and PDF guides specifically tailored for military entry tests.

By dedicating time to practice and revision, candidates can gain confidence and improve their accuracy in answering chemistry questions. Ultimately, a strong performance in the chemistry section can significantly boost overall scores, bringing candidates one step closer to achieving their dreams of serving in the armed forces. Given MCQs f Chemistry are based on graduation level and best for commission jobs in Pak Navy and Army.

Online MCQs of Chemistry Free Preparation

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Chemistry Tests Quiz (Graduation Level)

1 / 25

Each turn of DNA has a pitch in nm of:-

3.4

1.4

4.4

2.4

2 / 25

The basic strength of hydrides of group 15 elements vary in the following order:-

NH3< PH3> AsH3> SbH3< BiH3

NH3> PH3> AsH3> SbH3> BiH3

NH3> PH3< AsH3> SbH3> BiH3

NH3> PH3> AsH3< SbH3> BiH3

3 / 25

Lead glass contains main constituents:-

PbO and Al2O3

None of them

Both of them

Al2O4 and B2O3

4 / 25

_______ can be obtained by electrolysis of an aqueous solution of MgCl2:-

Sodium

Lithium

Metallic magnessium

Calcium

5 / 25

Effect of raising the temperature for 20-80°C on enzyme activity would be:-

Increasing velocity

Increasing followed by decreasing velocity

Decreasing velocity

All of the above

6 / 25

The proportion of lime, alumina or silica for good cement is:-

none of these

Both of these

1.9-2.5

2.5-3.5

7 / 25

Which of the following are requirements for carrier gas used in GC analysis:-

must be free of oxygen

all of the above

,must be inert

It must be dry

8 / 25

The technique used to determined the isoelectric point of a protein is called:-

all of these

pH gradient gel filtration

Isoelectric focusing

Isoelectric poising

9 / 25

Which of the following has least electron affinity:-

Nitrogen

Boron

Oxygen

Argon

10 / 25

The dissolved organic matter of the waste water is removed by biological process involving bacteria. This step is related to which treatment of waste water:-

Tertiary

Primary

All above

Secondary

11 / 25

Which of the following occurs in a cell as a result of insulin binding to its receptors:-

Glycogen synthase becomes activated

None of these

Both of these

Glucose is released from the cell

12 / 25

Use of addition of brine solution in the production of soap:-

none of them

lower the solubility of soap

speed up the reaction

remove unreacted castor oil and sodium hydroxide

13 / 25

Which factor affect ionization energy:-

Nuclear charge

All above

Shielding effect

Atomic radius

14 / 25

Structure of individual can be determined by:-

Recombinant DNA technology

Genetic engineering

DNA sequencing

Gene cloning

15 / 25

For highly paraffine crude oil, the characterization factor will be in range of:-

14.5-15.0

13.5-14.0

11.5-12.5

12.5-13.0

16 / 25

Graphite is a good conductor of heat and electricity because of:-

free electrons

none of them

sp2 hybridized carbon atoms

free atoms

17 / 25

The halides of Boron and Aluminium are:-

Strong acid

Lewis base

Weak acid

Lewis acid

18 / 25

The formula of borax glass is:-

None of the above

Na2B4O7. 5H2O

Na2B4O7

Na2B4O7. 10H2O

19 / 25

Techniques involved in pollutant analysis:-

GC-MS

All above

LCMS

Atomic absorption spectrophotometry

20 / 25

________ provides life sustaining oxygen:-

Biosphere

Hydrosphere

Lithosphere

Atmosphere

21 / 25

In which form is glucose liberated from glycogen:-

Glucose-1-phosphate

All of the above

Glucose-6-phosphate

UDP-glucose

22 / 25

The range of sound pressure for uncomfortable level is:-

50-90 dB

130-140 dB

80-90 dB

100-120 dB

23 / 25

Soapy detergents and soapless detergents behave differently in hard water because they have:-

all of them

different PH value

different hydrophobic hydrocarbon chains

different hydrophilic heads

24 / 25

Which of the following carbon clusters are possible:-

C76

C50

C32

All above

25 / 25

During the preparation of soap te liquid separated by distillation is:-

glycerol

methanol

ethanol

sodium hydroxide

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More Important MCQs of Chemistry Quiz Solved Past Experiences

1. What is the chemical formula of sodium bicarbonate?

A) Na₂CO₃
B) NaHCO₃
C) NaCl
D) NaOH

Correct Answer: B) NaHCO₃

2. Which of the following is an example of a homogeneous mixture?

A) Sand and water
B) Oil and water
C) Salt and water
D) Iron and sulfur

Correct Answer: C) Salt and water

3. Which of these elements is a transition metal?

A) Sodium
B) Copper
C) Oxygen
D) Chlorine

Correct Answer: B) Copper

4. The chemical formula of hydrochloric acid is:

A) H₂SO₄
B) HCl
C) HNO₃
D) H₂O

Correct Answer: B) HCl

5. Which of the following is a characteristic property of acids?

A) Bitter taste
B) Turns blue litmus paper red
C) Slippery to the touch
D) Produces a yellow flame when burned

Correct Answer: B) Turns blue litmus paper red

6. The process by which a solid turns directly into a gas is called:

A) Sublimation
B) Melting
C) Condensation
D) Evaporation

Correct Answer: A) Sublimation

7. What is the main gas responsible for the greenhouse effect?

A) Nitrogen
B) Carbon dioxide
C) Oxygen
D) Hydrogen

Correct Answer: B) Carbon dioxide

8. Which of the following elements is found in all organic compounds?

A) Nitrogen
B) Oxygen
C) Carbon
D) Hydrogen

Correct Answer: C) Carbon

9. The process of changing a liquid into a gas below its boiling point is called:

A) Evaporation
B) Boiling
C) Condensation
D) Freezing

Correct Answer: A) Evaporation

10. The compound NaOH is known as:

A) Sodium nitrate
B) Sodium carbonate
C) Sodium hydroxide
D) Sodium chloride

Correct Answer: C) Sodium hydroxide

11. Which of the following is not an alkali metal?

A) Lithium
B) Sodium
C) Potassium
D) Calcium

Correct Answer: D) Calcium

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

A) Condensation
B) Evaporation
C) Freezing
D) Sublimation

Correct Answer: A) Condensation

13. The atomic number of an element is equal to the number of:

A) Protons
B) Electrons
C) Neutrons
D) Protons and neutrons

Correct Answer: A) Protons

14. What is the formula of ammonia?

A) NH₄
B) NH₃
C) N₂H₄
D) NH₂

Correct Answer: B) NH₃

15. Which of the following is a good conductor of electricity?

A) Wood
B) Glass
C) Copper
D) Plastic

Correct Answer: C) Copper

16. Which of the following is not a property of ionic compounds?

A) They conduct electricity in molten state
B) They have high melting and boiling points
C) They are generally soluble in water
D) They are poor conductors of electricity in solution

Correct Answer: D) They are poor conductors of electricity in solution

17. The most reactive non-metal is:

A) Fluorine
B) Chlorine
C) Oxygen
D) Nitrogen

Correct Answer: A) Fluorine

18. Which of the following is an example of a synthetic polymer?

A) Silk
B) Nylon
C) Cotton
D) Wool

Correct Answer: B) Nylon

19. Which of the following substances is a natural polymer?

A) Polystyrene
B) Nylon
C) Cellulose
D) PVC

Correct Answer: C) Cellulose

20. The process of breaking down large molecules into smaller ones by the use of heat or chemicals is called:

A) Polymerization
B) Condensation
C) Hydrolysis
D) Cracking

Correct Answer: D) Cracking

More Past Experiences MCQs of Chemistry with Answers

21. Which of the following is the main constituent of natural gas?

A) Methane
B) Ethane
C) Propane
D) Butane

Correct Answer: A) Methane

22. What is the name of the process by which a solid changes directly into a gas?

A) Freezing
B) Sublimation
C) Condensation
D) Melting

Correct Answer: B) Sublimation

23. Which of the following compounds is commonly used as a bleaching agent?

A) Sodium chloride
B) Hydrogen peroxide
C) Potassium nitrate
D) Sulfuric acid

Correct Answer: B) Hydrogen peroxide

24. What is the electronic configuration of oxygen (atomic number 8)?

A) 1s² 2s² 2p⁶
B) 1s² 2s² 2p⁴
C) 1s² 2s² 2p³
D) 1s² 2s¹ 2p⁶

Correct Answer: B) 1s² 2s² 2p⁴

25. Which of the following is an example of a heterogeneous mixture?

A) Saltwater
B) Air
C) Blood
D) Vinegar

Correct Answer: C) Blood

26. What is the boiling point of water at standard atmospheric pressure?

A) 100°C
B) 90°C
C) 0°C
D) 200°C

Correct Answer: A) 100°C

27. Which of the following is the most stable isotope of hydrogen?

A) Deuterium
B) Tritium
C) Protium
D) None of the above

Correct Answer: C) Protium

28. Which of the following gases is produced during the reaction between zinc and hydrochloric acid?

A) Nitrogen
B) Oxygen
C) Hydrogen
D) Carbon dioxide

Correct Answer: C) Hydrogen

29. Which of the following is the most electronegative element?

A) Sodium
B) Oxygen
C) Chlorine
D) Fluorine

Correct Answer: D) Fluorine

30. What type of bond is formed when electrons are shared between two atoms?

A) Ionic bond
B) Covalent bond
C) Metallic bond
D) Hydrogen bond

Correct Answer: B) Covalent bond

31. Which of the following is a property of metals?

A) Poor conductors of heat
B) Brittle
C) Malleable
D) Do not conduct electricity

Correct Answer: C) Malleable

32. The atomic mass of an element is the sum of:

A) The number of electrons and protons
B) The number of protons and neutrons
C) The number of protons and electrons
D) The number of neutrons and electrons

Correct Answer: B) The number of protons and neutrons

33. Which of the following substances is commonly used to make soap?

A) Sodium chloride
B) Sodium hydroxide
C) Potassium chloride
D) Sodium carbonate

Correct Answer: B) Sodium hydroxide

34. What is the name of the compound with the formula Na₂SO₄?

A) Sodium sulfate
B) Sodium sulfide
C) Sodium sulfite
D) Sodium sulfate tetrahydrate

Correct Answer: A) Sodium sulfate

35. The chemical reaction between an acid and a base results in the formation of:

A) Salt and water
B) Salt and hydrogen gas
C) Oxygen and water
D) Oxygen and hydrogen

Correct Answer: A) Salt and water

36. Which of the following elements is most commonly found in the Earth’s crust?

A) Oxygen
B) Carbon
C) Nitrogen
D) Hydrogen

Correct Answer: A) Oxygen

37. Which of the following compounds is commonly used as a disinfectant?

A) Ammonia
B) Hydrogen peroxide
C) Sodium chloride
D) Methane

Correct Answer: B) Hydrogen peroxide

38. What is the formula for the compound formed between calcium (Ca) and chlorine (Cl)?

A) CaCl
B) CaCl₂
C) Ca₂Cl
D) Ca₂Cl₃

Correct Answer: B) CaCl₂

39. Which of the following substances is a good example of a non-metal?

A) Oxygen
B) Iron
C) Copper
D) Magnesium

Correct Answer: A) Oxygen

40. The boiling point of a liquid is the temperature at which:

A) The liquid starts freezing
B) The liquid begins to evaporate
C) The liquid starts to boil and turn into gas
D) The liquid condenses into a solid

Correct Answer: C) The liquid starts to boil and turn into gas

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