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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

____ is not an iso electronic:-

K+

2 / 25

Dead burnt gypsum is:-

CaSO4.1/2H20

CaSO4.2H20

MgSO4.7H2O

CaSO4

3 / 25

Which of the following analytical method is based on refraction of radiations:-

Conductometry

Refractometry

Polarography

Coulometry

4 / 25

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

NO2

N2O

N2O3

5 / 25

Which color is absorbed if the transmitted color is yellow:-

red

Green

Blue

purple

6 / 25

The vapour pressure of liquid increase with the :

Increase of pressure

Increase of temperature

Increase of intermolecular forces

Increase of polarity of molecules

7 / 25

Cement was introduced by a mason:-

Joseph Aspdin

D-H Whore

Humphry Davy

F.Wholer

8 / 25

During nitration of benzene the active nitrating agent is:-

NO2-

HNO3

NO2+

NO3

9 / 25

Which is the king of chemicals:

Ammonia

Sulphuric dioxide

Sulphuric acid

Nitrogen

10 / 25

3.6 × 10 ²³ atoms of ___ are present in 18 g of glucose:-

Carbon

None of them

Hydrogen

Oxygen

11 / 25

Major components of earth's crust, oceans & atmosphere are:

Metals

Non Metals

Halogens

Metalloid

12 / 25

Which element is most abundant in earth crust:-

13 / 25

Rotatory kiln has how many zones:-

14 / 25

Which of the following step is involved in quantitative analysis:-

conversion into a suitable form for analysis

sampling

measurement of properties

All of the above

15 / 25

Acetic acid is manufactured commercially by:-

Fermentation

Distillation

Ozonolysis

Esterification

16 / 25

Yellow colour of nitric acid is due to:-

NO2

N2O4

N2O

17 / 25

Chlorine react with benzene in the presence of sunlight to give:-

Chlorobenzene

Hexachlorobenzene

Benzoyl chloride

ortho-para dichlorobenzene

18 / 25

Chemically Baeyer's reagent is ______ % alkaline KMnO4:-

19 / 25

_____ alkyl halides gives SN2 mechanism:-

primary

secondary

all of them

tertiary

20 / 25

The conversion of n-hexane into benzene by heating in the presence of ( Al2O3 + SiO2 + Cr2O3) is called:-

Aromatization

Rearrangement

Isomerization

Dealkylation

21 / 25

In which compound the oxidation state of N is +1:-

N2O

N2O4

NO2

22 / 25

The number of significant figures in the number 80.7 is:-

23 / 25

Which is correct about the limitation of flamed AAS:-

Detection limits are higher

All of the above

Formation of the refractory oxides

It use toxic gases as fuel

24 / 25

The substance that retard the activity of enzyme is called;-

Inhibitor

Apoenzyme

Co-enzyme

Activator

25 / 25

Radius of the third shell of H-atoms is:-

3.716 Å

4.761 Å

5.716 Å

6.671 Å

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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