Chemistry MCQ Quiz - Objective Question with Answer for Chemistry - Download Free PDF

Last updated on Jun 11, 2025

Chemistry MCQs comprise multiple choice questions that cover a wide range of topics in the field of chemistry. This includes topics such as, structure of atoms, the periodic table, chemical bonding, chemical reactions, stoichiometry, gas laws, and more. These fundamentals serve as building blocks for more advanced concepts in chemistry. Candidates preparing for competitive exams like UPSC, Bank exams and others must practice these MCQs related to Chemical Science as Science & Technology is a crucial syllabus component in these exams. Give a quick boost to your exam preparation by solving Chemical MCQs with answers right away.

Latest Chemistry MCQ Objective Questions

Chemistry Question 1:

The chemical name of bakelite is

  1. polytetrafluoroethylene
  2. phenol formaldehyde
  3. phenol acetaldehyde
  4. urea formaldehyde
  5. None of the above

Answer (Detailed Solution Below)

Option 2 : phenol formaldehyde

Chemistry Question 1 Detailed Solution

Explanation:

Bakelite is a polymer that is made up of the monomers phenol and Formaldehyde. This phenol-Formaldehyde is a Thermosetting polymer.

Some important properties of Bakelite are listed below.

  • It can be easily Molded.
  • Very smooth molding can be obtained from this polymer.
  • Bakelite moldings are heat resistant and scratch-resistant.
  • Owing to its low electrical conductivity, bakelite is resistant to electric current.

Bakelite structure:

Important Points

  • Bakelite is used for making electrical switches.
  • Melamine is used for floor tiles.

Chemistry Question 2:

One of the characteristics of polymer is 

  1. High temperature stability
  2. High mechanical strength
  3. High elongation
  4. Low hardness
  5. None of the above

Answer (Detailed Solution Below)

Option 3 : High elongation

Chemistry Question 2 Detailed Solution

The correct answer is High elongation.

Explanation:

Polymers

  • They are giant molecules. They are important chemicals in our bodies (proteins, poly(nucleic acids)), in plants (starch, cellulose), and in our everyday lives (fibres, plastics, elastomers).
  • Every polymer has its own characteristics, but most polymers have the following general properties.

Additional Information 

  • Characteristics of Polymers
    • Low specific gravity and high specific strength
    • Thermal and electrical insulations
    • Corrosion and weather resistances
    • They can be processed in various ways to produce thin fibres or intricate parts (High elongation)
    • Ease in design and manufacturing of complicated structures
    • Outstanding aesthetic appeal due to ease in the adoption of permanent colours
    • Mass production with low energy-intensive manufacturing techniques
    • Ease in printability and adhesion
    • Ease in handling and cleanliness
    • Offering tremendous scope of physical and chemical modification to meet industrial and consumer requirement
    • Tremendous adaptability to low-cost production.

Chemistry Question 3:

Superconductors are derived from the compounds of:

  1. s-block elements
  2. Lanthanides
  3. Actinides
  4. Transition elements
  5. None of the above

Answer (Detailed Solution Below)

Option 4 : Transition elements

Chemistry Question 3 Detailed Solution

The correct answer is Transition elements.Key PointsSuperconductors:

  • Superconductivity is a set of physical properties:
    • electrical resistance vanishes 
    • magnetic flux fields are expelled from the material.
  • Unlike an ordinary metallic conductor, whose resistance decreases gradually as its temperature is lowered even down to near absolute zero
  • A superconductor has a characteristic critical temperature below which the resistance drops abruptly to zero.
  • An electric current through a loop of superconducting wire can persist indefinitely with no power source.
  • Superconductor material classes include chemical elements (e.g. mercury or lead), alloys (such as niobium-titanium, germanium–niobium, and niobium nitride), ceramics (YBCO and magnesium diboride), etc.
  • Superconductors are mostly compounds of transition metal. Hence option 4 is correct.

Chemistry Question 4:

Silver ware turns black after a period of time due to the formation of __________.

  1. Nitrate coating on silver
  2. Sulphide coating on silver
  3. Chloride coating on silver
  4. Oxide coating on silver
  5. None of the above

Answer (Detailed Solution Below)

Option 2 : Sulphide coating on silver

Chemistry Question 4 Detailed Solution

The correct answer is Sulphide coating on silver.

  • Silver does not react with oxygen as it is highly unreactive.

Key Points

  • But over time its surface turns black due to exposure to the air.
  • Due to the availability of Hydrogen Sulphide (H2S) in the air, a layer of silver Sulphide (Ag2S) is formed and silver loses its shine.
  • This blackness can be minimized by covering it with polythene.
  • This blackness is a temporary effect on the surface and can be removed by rubbing with a mild soap solution prepared in warm water

Chemistry Question 5:

Tomato is a natural source of which acid?

  1. Acetic Acid
  2. Citric Acid
  3. Tartaric Acid
  4. Oxalic Acid
  5. None of the above

Answer (Detailed Solution Below)

Option 4 : Oxalic Acid

Chemistry Question 5 Detailed Solution

The correct answer is Oxalic Acid.

Key Points

  • Tomato is a natural source of Oxalic acid.
  • Oxalic Acid is most likely to be found in Spinach.
  • Oxalic acid is an organic compound found in many plants.
  • Moderately high contents of oxalic acid were recorded in all varieties of tea leaves.
  • Oxalic acid, also called ethanedioic acid, a colorless, crystalline, toxic organic compound belonging to the family of carboxylic acids.

Additional Information 

Substance Acid
Lemon \ Orange Citric Acid
Ant Sting Formic Acid
Vinegar Acetic Acid
Curd Lactic Acid
Grapes Tartaric acid
Amla (Vitamin C) Ascorbic Acid
Spinach, Tomato Oxalic Acid

Top Chemistry MCQ Objective Questions

Chemical name of washing soda is:

  1. Sodium chloride
  2. Sodium hydrogen carbonate
  3. Sodium carbonate
  4. Sodium hydroxide

Answer (Detailed Solution Below)

Option 3 : Sodium carbonate

Chemistry Question 6 Detailed Solution

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The correct answer is Sodium carbonate.

Explanation:

  • Washing soda is a chemical compound with the formula Na2CO3, known as sodium carbonate, and it's a salt of carbonic acid.
  • Properties of a Washing soda:
    • It is a transparent crystalline solid.
    • It is one of the few metal carbonates which are soluble in water.
    • It is alkaline with a pH level of 11, it turns red litmus to blue.
    • It has detergent properties or cleansing properties because it can remove dirt and grease from dirty clothes, etc.
    • It attacks dirt and grease to form water-soluble products, which are then washed away on rinsing with water.

Important Points

Some common chemical compounds with their common names are:

Chemical Compounds

Common Names

Chemical Formulas

Sodium Bicarbonate

Baking Soda

NaHCO3

Calcium ChlorohypoChlorite

Bleaching Powder

CaOCl2

Sodium Hydroxide

Caustic Soda

NaOH

Sodium Carbonate

Washing Soda

Na2CO3 .10 H2O

Carbon Dioxide

Dry Ice

CO2

Copper Sulphate

Blue Vitriol

CuSO4

Ferrous Sulphate

Green Vitriol

FeSO4

Sulphuric Acid

Oil of vitriol

H2SO4

Calcium Sulphate Hemihydrate

Plaster of Paris

(CaSO4. 1/2H2O)

Calcium Sulphate Dihydrate

Gypsum

CaSO4.2H2O

Calcium Hydroxide

Slaked Lime

Ca(OH)2

Chile Saltpeter

Sodium nitrate

NaNO3

Saltpetre

Potassium nitrate

KNO3

Muriatic acid

Hydrochloric acid

HCl

 

Which of the following is called 'Pearl ash'?

  1. Na2CO3
  2. NaHCO3
  3. K2CO3
  4. CaCO3

Answer (Detailed Solution Below)

Option 3 : K2CO3

Chemistry Question 7 Detailed Solution

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K2COor potassium carbonate is known as pearl ash.

  • Pearl ash, in ancient times, was created by baking potash in a kiln in order to remove impurities. The remaining fine, white powder was pearl ash.
  • Potassium carbonate is an inorganic compound and a white salt which is soluble in water.
  • It is mainly used in the production of glass and soap.

Additional Information

Chemical Formula Chemical Name Common Name
Na2CO3 Sodium Carbonate Washing soda
NaHCO3 Sodium bicarbonate Baking soda
K2CO3 Potasium carbonate Pearl ash
CaCO3 Calsium carbonate Limestone

When 1 litre of water is cooled from 4°C to 0°C, its volume _____.

  1. first decreases and then increases
  2. remains the same
  3. increases
  4. decreases

Answer (Detailed Solution Below)

Option 3 : increases

Chemistry Question 8 Detailed Solution

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The correct answer is increases.

Important Points

  • In normal cases, the volume of substances increases on heating and decreases while cooling.
  • When 1 litre of water is cooled from 4°C to 0°C volume of water will start increasing this due to water's unique property known as 'Anomalous Expansion of Water'.
  • Anomalous Expansion of Water occurs between 4°C to 0°C.
  • The density of water is a maximum at 4 °C.
  • When water is cooled from 4°C to 0°C, its density decreases.
  • The anomalous expansion of water helps preserve aquatic life during very cold weather.

Explanation:

  • When water reaches 4°C the molecules have been pushed as close to one another as possible and the density of water becomes precisely 1.00 g/cm³
  • When water freezes at 0°C due to the crystal structure the molecules arranged in some structured fashion so a little far apart ended up less dense - 0.93 g/cm - and so floats due to buoyancy.

As density decreases the volume increases.

Volume = mass /density.

Which of the following acid is found in Nettle plant?

  1. Methanoic acid
  2. Citric Acid
  3. Ethanoic Acid
  4. Oxalic acid

Answer (Detailed Solution Below)

Option 1 : Methanoic acid

Chemistry Question 9 Detailed Solution

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The correct answer is Methanoic acid.

Key Points

  • Nettle is an herbaceous plant that grows in the wild.
  • Nettle leaves have stinging hair, which causes painful stings when touched accidentally. 
  • This is due to the methanoic acid secreted by them. 
  • A traditional remedy is rubbing the area with the leaf of the dock plant, which often grows beside the nettle.

Additional Information

Natural source

Acid present

Vinegar

Acetic Acid

Orange

Citric acid

Tamarind

Tartaric acid

Tomato

Oxalic acid

Curd 

Lactic acid 

Lemon 

Citric acid

Nettle plant 

Methanoic acid

CO2 when passed in excess, in lime water turns colourless again because of:

  1. Calcium Carbonate
  2. Calcium bicarbonate
  3. Calcium Chloride
  4. Copper Carbonate

Answer (Detailed Solution Below)

Option 2 : Calcium bicarbonate

Chemistry Question 10 Detailed Solution

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Explanation:

  • Calcium hydroxide is sparingly soluble in water producing an alkaline solution known as limewater.
  • Calcium Carbonate is a chemical compound found commonly in rocks as minerals and is the main component of pearls and the shells of marine organisms, eggs, etc.
  • When carbon dioxide gas is passed through or over limewater, it turns milky due to the formation of calcium carbonate.
  • In the chemical reaction it can be shown as :

">Ca(OH)2Lime water (aq) + CO2 (g)Carbon Dioxide  CaCO3 (g)Calcium Carbonate" id="MathJax-Element-1-Frame" role="presentation" style="display: inline; position: relative;" tabindex="0">">Ca(OH)2Lime water (aq) + CO2 (g)Carbon Dioxide  CaCO3 (g)Calcium Carbonate" role="presentation" style="display: inline; position: relative;" tabindex="0">Ca(OH)2

  • However, when an excess of CO2 ​is passed through this solution, the milkiness disappears. This is due to the formation of calcium bicarbonate which is colorless and soluble in water.

">Ca(OH)2Lime water (aq) + CO2 (g)Carbon Dioxide  CaCO3 (g)Calcium Carbonate" role="presentation" style="display: inline; position: relative;" tabindex="0">Lime water (aq) + CO2 (g)Carbon Dioxide  CaCO3 (g)Calcium Carbonate

 

Additional Information Reaction involved-

CaCO3 + 2HCl →  CaCl+ CO2 + H2O

  • The evolved gas is carbon dioxide which then passes through lime water and turns it milky.

Ca(OH)2 + CO2  H2O + CaCO3  

  • Due to formation of these compounds
  • when excess CO2 is passed

CaCO3 + H2O + CO2   Ca(HCO3)2 

  • Bicarbonate is formed which again clears the solution

Mistake Points

  •  Do not confuse Calcium carbonate and calcium bicarbonate.
  • One produces white colour while the other makes it colourless.

Which of the following is NOT the correct match?

  1. The acid present in tomato – Formic acid
  2. The acid present in orange – citric acid
  3. The acid present in grapes – Tartaric acid
  4. The acid present in rancid butter – Butyric acid

Answer (Detailed Solution Below)

Option 1 : The acid present in tomato – Formic acid

Chemistry Question 11 Detailed Solution

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The correct answer is The acid present in tomatoes.

Key Points

  • Oxalic acid is a chemical compound that occurs naturally in almost every plant to some degree, including fruit, vegetable and grain plants. 
  • Tomato contains more than 10 types of acids such as citric acid, malic acid, ascorbic acid, oxalic acid etc
  • The oxalic acid content of tomatoes is about 50 mg per 100 g serving

Additional Information 

  • Some natural sources of acid:
Natural Source Acid
Vinegar  Acetic acid
Orange  Citric acid 
Tamarind /Grapes Tartaric acid
Sour milk (Curd)  Lactic acid
Lemon  Citric acid
Ant sting  Formic acid
Rancid Butter Butyric acid
Nettle sting  Methanoic acid

Who coined the word ‘atom’?

  1. Democritus
  2. Thomson
  3. E Rutherford
  4. John Dalton

Answer (Detailed Solution Below)

Option 1 : Democritus

Chemistry Question 12 Detailed Solution

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  • The word ‘atom’ is coined by Democritus.
  • He suggested that if we go on dividing matter at a certain point the atom becomes indivisible or cannot be divided further.
  • He called these particles as atoms (Indivisible).
  •  

    Scientist

    Discovered

    Thomson

    Electron

    E Rutherford

    Discovered alpha and beta particles

    John Dalton

    Father of Atomic Theory

The elements in the first group of s-block are also known as ________ .

  1. Alkali metals
  2. Alkaline Earth Metals
  3. Halogens
  4. Noble gases

Answer (Detailed Solution Below)

Option 1 : Alkali metals

Chemistry Question 13 Detailed Solution

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The correct answer is option 1, i.e  Alkali Metals.

EXPLANATION:

  • The elements in the first group of s-block are also known as Alkali Metals. These have only one electron in their outermost shell and hence are quite reactive as they easily lose their electron to form bonds with non-metals.

  • The elements in the second group of s-block are also known as Alkaline Earth Metals. These have two electrons in their outermost shell and are less reactive than Alkali metals.
  • Halogens are the group 17 elements and are placed in the p-block.
  • Noble gases are the group 18 elements and are placed in the p-block. These are the least reactive amongst all the elements found in the periodic table as they have a stable configuration.

How many water molecules are present in one molecule of washing soda?

  1. 8
  2. 5
  3. 7
  4. 10

Answer (Detailed Solution Below)

Option 4 : 10

Chemistry Question 14 Detailed Solution

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  • The number of water molecules present is washing soda is 10.
  • We know the molecular formula for Washing Soda is Na2CO3.10H2O.
  • Recrystallisation of Sodium Carbonate (Na2CO3) gives washing soda.
  • In a Washing soda, water is present in the form of crystals.

Which acid is present in sour milk?

  1. Citric Acid
  2. Acetic Acid
  3. Glycolic Acid
  4. Lactic Acid

Answer (Detailed Solution Below)

Option 4 : Lactic Acid

Chemistry Question 15 Detailed Solution

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The correct answer is Lactic Acid.

Key Points

  • Lactic acid is present in Sour milk or curd.
  • The sourness of the milk is due to the presence of lactic acid.
  • Human beings feel tired due to the accumulation of lactic acid in the muscles.

Additional Information

Natural source Acid
Vinegar Acetic acid
Orange Citric acid
Tamarind Tartaric acid
Tomato Oxalic acid

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