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Free Online Chemistry Quiz with Answers

Many past candidates have shared their experiences, highlighting that the chemistry section in initial tests often includes questions from past papers and frequently repeated topics. For instance, questions related to stoichiometry, chemical reactions, and the properties of elements are commonly asked.

Candidates who practiced these MCQs thoroughly were able to identify patterns and frequently tested concepts, which helped them perform well in the exams. Additionally, solving chemistry MCQs from previous years’ papers and mock tests has proven to be an effective strategy for understanding the exam format and time management. Given online Chemistry quiz are most helpful for PN Cadet initial tests and also for Pak Navy Civilian jobs with F.Sc or intermediate level qualification tests.

Online Chemistry Quiz for Free Practice and Preparation

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Chemistry Tests Quiz (Inter Level)

1 / 25

Amount of carbon content in liginate is

70%

80%

90%

60%

2 / 25

In the long form of the periodic table, the most electropositive element occupy:-

Bottom left position

Bottom right position

Top left position

Top right position

3 / 25

The partial pressure of oxygen in air is:-

760 torr

116 torr

323 torr

159 torr

4 / 25

Which of the following gives iodoform test:-

C2H5OH

1-Propanol

CH3OH

Methanal

5 / 25

Rising of a wetting liquid in a capillary tube is due to:-

Viscosity

Cohesive forces

Adhesive forces

Surface tension

6 / 25

which is used to measure absorbance at various wavelength;-

colorimeter

spectrometer

photometr

Spectrophotometer

7 / 25

The least number of molecule is present in 30 g of :-

NO2

N2O3

N2O

8 / 25

Benzene does not undergo:-

Polymerization

Addition

Substitution

Aromatization

9 / 25

CH₃-O_CH₃ is called ___?

Diethyl ether

Propyl ether

Ethyl methyl ether

Dimethyl ether

10 / 25

The elements with lowest M.p:-

11 / 25

The compound which increase the weight of soap:

Sodium silicate

Sodium chloride

Sodium phosphate

Sodium sulphate

12 / 25

Cyanohydrins are formed by the _____ reaction mechanism:-

Free radical

Nucleophilic addition

Nucleophilic substitution

Electrophilic addition

13 / 25

The wave number of the light emitted by a certain source is 2 × 10⁶ m^-1. The wavelength of this light will be:-

500 nm

200 nm

200 m

500 m

14 / 25

Ninhydrin reacts with amino acid to form product which has colour:-

Bluish violet

Violet

Blue

Red

15 / 25

Which one of the following liquid has low vapour pressure at 25°C:-

Diethyl ether

Acetone

Water

Ethyl alcohol

16 / 25

Main source of aromatic hydrocarbon is:-

Petroleum

Dead marine animals

Living organisms

Coal tar

17 / 25

Which is a mixed ketone:-

Benzophenone

Acetone

Diethyl ketone

Acetophenone

18 / 25

Which is correct about advantages of flamed AAS:-

All of the above

easy to use

A robust method

quite inexpensive

19 / 25

Height above the earth surface of mesosphere is

50 to 85 km

85 to 120km

120to 130km

130to 180km

20 / 25

SN2 mechanism involves ____ order kinetics:-

first

zero

none of them

second

21 / 25

The isotopes C-12 is presents in abundance of :

96.9%

None of these

97.6%

99.7%

22 / 25

Ethanol can be converted in ethanoic acid by:-

Hydrogenation

Fermentation

Oxidation

Hydration

23 / 25

During nitration of benzene the active nitrating agent is:-

NO3

NO2-

HNO3

NO2+

24 / 25

Which of the following is not ionic hydride:-

NaH

LiH

HCl

CsH

25 / 25

Milikan used ____ in his atomizer:-

Oil

Honey

Milk

water

Your score is

The average score is 43%

More Past Experiences of Chemistry Quiz with Answers

1. Which of the following is the correct formula for sulfur dioxide?

A) SO
B) SO₂
C) SO₃
D) S₂O₃

Correct Answer: B) SO₂

2. What is the pH value of pure water at 25°C?

A) 7
B) 0
C) 14
D) 5

Correct Answer: A) 7

3. The atomic number of an element is determined by the number of:

A) Protons
B) Neutrons
C) Electrons
D) Nucleons

Correct Answer: A) Protons

4. Which of the following is a noble gas?

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

Correct Answer: C) Neon

5. Which of these elements is a halogen?

A) Sodium
B) Chlorine
C) Calcium
D) Helium

Correct Answer: B) Chlorine

6. What is the molecular formula of methane?

A) CH₄
B) C₂H₆
C) C₆H₆
D) C₄H₁₀

Correct Answer: A) CH₄

7. The process of converting a liquid into gas at its boiling point is called:

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

Correct Answer: D) Boiling

8. Which of the following compounds is used in the preparation of hydrochloric acid?

A) Sodium chloride
B) Potassium chloride
C) Sodium carbonate
D) Sulfuric acid

Correct Answer: D) Sulfuric acid

9. The main component of natural gas is:

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

Correct Answer: C) Methane

10. Which of these is an example of an exothermic reaction?

A) Melting of ice
B) Boiling of water
C) Combustion of fuel
D) Dissolving of salt in water

Correct Answer: C) Combustion of fuel

11. Which of the following is not an alkaline earth metal?

A) Magnesium
B) Calcium
C) Strontium
D) Sodium

Correct Answer: D) Sodium

12. What is the unit of the rate constant in a first-order reaction?

A) L/mol·s
B) 1/s
C) mol/L·s
D) mol/L

Correct Answer: B) 1/s

13. What is the electronic configuration of the element with atomic number 11?

A) 1s² 2s² 2p⁶ 3s²
B) 1s² 2s² 2p⁶ 3s² 3p¹
C) 1s² 2s² 2p⁶ 3s² 3p²
D) 1s² 2s² 2p⁶ 3s¹

Correct Answer: D) 1s² 2s² 2p⁶ 3s¹

14. The substance that speeds up a chemical reaction without itself being consumed is called a:

A) Catalyst
B) Reagent
C) Solvent
D) Product

Correct Answer: A) Catalyst

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

A) Bitter taste
B) Slippery feel
C) Turns red litmus paper blue
D) Sour taste

Correct Answer: D) Sour taste

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

A) Copper
B) Carbon
C) Iron
D) Silver

Correct Answer: B) Carbon

17. What is the name of the compound with the formula NaCl?

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

Correct Answer: B) Sodium chloride

18. The chemical symbol for Iron is:

A) Fe
B) Ir
C) I
D) In

Correct Answer: A) Fe

19. Which of the following gases is responsible for global warming?

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

Correct Answer: C) Carbon dioxide

20. What is the product formed when sodium reacts with water?

A) Sodium hydroxide and hydrogen gas
B) Sodium chloride and water
C) Sodium carbonate and oxygen
D) Sodium bicarbonate and hydrogen gas

Correct Answer: A) Sodium hydroxide and hydrogen gas

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