Carbon and its Compounds MCQ

Carbon and its Compounds MCQ. Best 100 Multiple choice questions answers on “Carbon and its Compounds” Class 10 Chemistry to score full marks in your exams.

Introduction – Carbon and its Compounds MCQ

Question 1: Which element forms the basis for all living organisms and many everyday items?

A. Oxygen

B. Hydrogen

C. Carbon

D. Nitrogen

Question 2: In what forms is carbon significant?

A. Elemental form only

B. Combined form only

C. Both elemental and combined forms

D. None of the above

Question 3: Which of the following is NOT primarily made up of carbon compounds?

A. Food

B. Medicines

C. Metals

D. Clothes

Question 4: What is the foundation of all living structures?

A. Carbon

B. Oxygen

C. Nitrogen

D. Hydrogen

Question 5: Where is carbon predominantly found on Earth?

A. Earth’s crust

B. Atmosphere

C. Both Earth’s crust and atmosphere

D. None of the above

Question 6: In what forms is carbon present in the Earth’s crust?

A. Carbonates

B. Hydrogencarbonates

C. Coal and petroleum

D. All of the above

Question 7: What percentage of carbon dioxide is present in the atmosphere?

A. 0.02%

B. 0.03%

C. 0.2%

D. 0.3%

Question 8: Despite its limited availability, why is carbon so important?

A. Its ability to form strong bonds

B. Its ability to bond with various elements

C. Its versatility in forming different structures

D. All of the above

Bonding in Carbon – The Covalent Bond – Carbon and its Compounds MCQ

Question 9: Carbon compounds are generally:

A. Good conductors of electricity

B. Poor conductors of electricity

C. Semiconductors

D. Superconductors

Question 10: Compared to ionic compounds, carbon compounds have:

A. Higher melting and boiling points

B. Lower melting and boiling points

C. Similar melting and boiling points

D. None of the above

Question 11: The forces of attraction between molecules in carbon compounds are:

A. Very strong

B. Not very strong

C. Similar to ionic compounds

D. None of the above

Question 12: The bonding in carbon compounds does not result in the formation of:

A. Ions

B. Molecules

C. Covalent bonds

D. Shared electron pairs

Question 13: What is the atomic number of carbon?

A. 4

B. 6

C. 8

D. 12

Question 14: How many valence electrons does carbon have?

A. 2

B. 4

C. 6

D. 8

Question 15: How does carbon achieve stability?

A. By gaining electrons

B. By losing electrons

C. By sharing electrons

D. None of the above

Question 16: What is the simplest molecule formed by sharing valence electrons?

A. Hydrogen (H₂)

B. Chlorine (Cl₂)

C. Oxygen (O₂)

D. Nitrogen (N₂)

Question 17: What type of bond is formed when a shared pair of electrons constitutes a single covalent bond?

A. Ionic bond

B. Metallic bond

C. Covalent bond

D. Hydrogen bond

Question 18: Which of the following molecules exhibits a double bond?

A. Hydrogen (H₂)

B. Chlorine (Cl₂)

C. Oxygen (O₂)

D. Nitrogen (N₂)

Question 19: How many bonds are present in a molecule of nitrogen (N₂)?

A. Single bond

B. Double bond

C. Triple bond

D. No bond

Question 20: What is the formula of methane?

A. CH₄

B. C₂H₆

C. C₃H₈

D. C₄H₁₀

Question 21: How many hydrogen atoms are bonded to a carbon atom in methane?

A. 1

B. 2

C. 3

D. 4

Question 22: Covalent bonds are formed by:

A. Transfer of electrons

B. Sharing of electron pairs

C. Formation of ions

D. None of the above

Question 23: Which of the following statements is true about covalent compounds?

A. They have strong intermolecular forces.

B. They are generally good conductors of electricity

C. They have low melting and boiling points

D. They form ions in solution

Question 24: Which of the following is NOT an allotrope of carbon?

A. Diamond

B. Graphite

C. Fullerene

D. Methane

Question 25: Which allotrope of carbon is the hardest substance known?

A. Diamond

B. Graphite

C. Fullerene

D. None of the above

Versatile Nature of Carbon – Carbon and its Compounds MCQ

Question 26: Which two properties of carbon enable it to form a vast number of compounds?

A. Tetravalency and catenation

B. Catenation and isomerism

C. Tetravalency and isomerism

D. None of the above

Question 27: What is catenation?

A. The ability of carbon to form bonds with other carbon atoms

B. The ability of carbon to form different isomers

C. The ability of carbon to bond with hydrogen

D. None of the above

Question 28: Carbon compounds linked by only single bonds between carbon atoms are called:

A. Saturated compounds

B. Unsaturated compounds

C. Aromatic compounds

D. Aliphatic compounds

Question 29: Carbon compounds having double or triple bonds between carbon atoms are called:

A. Saturated compounds

B. Unsaturated compounds

C. Aromatic compounds

D. Aliphatic compounds

Question 30: Which of the following elements exhibits catenation to the greatest extent?

A. Carbon

B. Silicon

C. Oxygen

D. Nitrogen

Question 31: Why are carbon-carbon bonds strong and stable?

A. Large size of carbon atoms

B. Small size of carbon atoms

C. High electronegativity of carbon

D. Low electronegativity of carbon

Question 32: What is the valency of carbon?

A. 2

B. 3

C. 4

D. 5

Question 33: Carbon readily forms compounds with:

A. Oxygen

B. Hydrogen

C. Nitrogen

D. All of the above

Question 34: The strength of carbon bonds with other elements contributes to:

A. The instability of carbon compounds

B. The exceptional stability of carbon compounds

C. The reactivity of carbon compounds

D. None of the above

Question 35: What factor contributes to the formation of strong bonds by carbon?

A. Its large size

B. Its small size

C. Its high electronegativity

D. Its low electronegativity

Question 36: Compounds containing only carbon and hydrogen are called:

A. Hydrocarbons

B. Carbohydrates

C. Alcohols

D. Carboxylic acids

Question 37: Saturated hydrocarbons are also known as:

A. Alkanes

B. Alkenes

C. Alkynes

D. Aromatics

Question 38: Unsaturated hydrocarbons containing one or more double bonds are called:

A. Alkanes

B. Alkenes

C. Alkynes

D. Aromatics

Question 39: Which hydrocarbons contain one or more triple bonds?

A. Alkanes

B. Alkenes

C. Alkynes

D. Aromatics

Question 40: What are heteroatoms?

A. Carbon atoms in a hydrocarbon chain

B. Hydrogen atoms in a hydrocarbon chain

C. Elements replacing hydrogen in a hydrocarbon chain

D. Functional groups attached to a hydrocarbon chain

Question 41: Which of the following is NOT a heteroatom commonly found in carbon compounds?

A. Oxygen

B. Nitrogen

C. Sulfur

D. Calcium

Question 42: What are functional groups?

A. Heteroatoms that replace hydrogen in hydrocarbons

B. Groups containing heteroatoms that confer specific properties to compounds

C. Carbon chains of varying lengths

D. Compounds with the same molecular formula but different structures

Question 43: The properties of a carbon compound are primarily determined by:

A. The length of the carbon chain

B. The type of functional group present

C. The number of hydrogen atoms

D. The presence of heteroatoms

Question 44: What is a homologous series?

A. A series of compounds with the same functional group and varying carbon chain lengths

B. A series of compounds with different functional groups and the same carbon chain length

C. A series of compounds with the same molecular formula but different structures

D. None of the above

Question 45: As the molecular mass increases in a homologous series:

A. Melting and boiling points decrease

B. Melting and boiling points increase

C. Solubility decreases

D. Chemical properties change

Question 46: Which property remains similar in a homologous series?

A. Physical properties

B. Chemical properties

C. Both physical and chemical properties

D. None of the above

Question 47: The naming of carbon compounds is based on:

A. The name of the basic carbon chain

B. The nature of the functional group

C. Both A and B

D. None of the above

Question 48: If the suffix of a functional group starts with a vowel, how is the carbon chain name modified?

A. The final ‘e’ is deleted, and the suffix is added

B. The final ‘e’ is retained, and the suffix is added

C. The suffix is added without any modification

D. None of the above

Question 49: In the naming of unsaturated carbon chains, the final ‘ane’ is replaced with:

A. ‘ene’ or ‘yne’

B. ‘ol’ or ‘al’

C. ‘one’ or ‘oic acid’

D. None of the above

Question 50: Which of the following compounds would be named ‘propanone’?

A. A three-carbon chain with an alcohol group

B. A three-carbon chain with an aldehyde group

C. A three-carbon chain with a ketone group

D. A three-carbon chain with a carboxylic acid group

Chemical Properties of Carbon Compounds – Carbon and its Compounds MCQ

Question 51: What is the process of burning carbon and its compounds in oxygen called?

A. Combustion

B. Oxidation

C. Reduction

D. Hydrogenation

Question 52: Complete combustion of carbon compounds results in the formation of:

A. Carbon dioxide and water

B. Carbon monoxide and water

C. Carbon dioxide only

D. Water only

Question 53: Incomplete combustion of carbon compounds leads to the formation of:

A. Carbon dioxide and water

B. Carbon monoxide and water

C. Carbon dioxide only

D. Water only

Question 54: Which of the following is a major pollutant released during the combustion of fuels containing nitrogen and sulfur?

A. Carbon dioxide

B. Carbon monoxide

C. Oxides of sulfur and nitrogen

D. Water vapor

Question 55: The conversion of alcohols to carboxylic acids is an example of:

A. Combustion

B. Oxidation

C. Reduction

D. Hydrogenation

Question 56: Substances that add oxygen to other compounds are known as:

A. Oxidizing agents

B. Reducing agents

C. Catalysts

D. Dehydrating agents

Question 57: Which of the following is an example of an oxidizing agent?

A. Alkaline potassium permanganate

B. Acidified potassium dichromate

C. Both A and B

D. Neither A nor B

Question 58: The process of converting unsaturated hydrocarbons to saturated hydrocarbons by adding hydrogen is called:

A. Combustion

B. Oxidation

C. Reduction

D. Hydrogenation

Question 59: Hydrogenation is commonly used in:

A. The production of margarine

B. The hardening of vegetable oils

C. The creation of biodiesel

D. The synthesis of plastics

Question 60: In a substitution reaction:

A. One type of atom or group of atoms takes the place of another

B. Atoms are added to a molecule without any replacement

C. A molecule loses some of its atoms

D. None of the above

Question 61: Saturated hydrocarbons are generally:

A. Very reactive

B. Inert in the presence of most reagents

C. Easily oxidized

D. None of the above

Question 62: Which of the following reactions is an example of a substitution reaction?

A. Combustion of methane

B. Oxidation of ethanol

C. Hydrogenation of ethene

D. Reaction of methane with chlorine in sunlight

Question 63: The reaction of methane with chlorine in sunlight produces:

A. Chloromethane and hydrogen chloride

B. Chloromethane and water

C. Carbon dioxide and water

D. Ethane and hydrogen chloride

Question 64: Which of the following carbon compounds is a commercially important solvent used in medicines?

A. Methane

B. Ethane

C. Ethanol

D. Ethanoic acid

Question 65: What is the common name for ethanoic acid?

A. Formic acid

B. Acetic acid

C. Propionic acid

D. Butyric acid

Question 66: Which of the following is a characteristic property of carboxylic acids?

A. They are strong acids

B. They are weak acids

C. They are neutral

D. None of the above

Question 67: A 5-8% solution of acetic acid in water is known as:

A. Vinegar

B. Alcohol

C. Ester

D. Soap

Question 68: The melting point of pure ethanoic acid is:

A. 273 K

B. 290 K

C. 373 K

D. 390 K

Question 69: Which of the following terms describes the reaction of an acid and an alcohol to form an ester?

A. Saponification

B. Esterification

C. Hydrogenation

D. Combustion

Question 70: Esters are generally characterized by their:

A. Sweet smell

B. Pungent odor

C. Sour taste

D. Bitter taste

Question 71: The reaction of an ester with an alkali to produce alcohol and sodium salt of carboxylic acid is called:

A. Saponification

B. Esterification

C. Hydrogenation

D. Combustion

Question 72: Soaps are:

A. Sodium or potassium salts of long-chain carboxylic acids

B. Esters of long-chain carboxylic acids

C. Alcohols derived from long-chain carboxylic acids

D. None of the above

Question 73: Ethanoic acid reacts with sodium hydroxide to produce:

A. Sodium ethanoate and water

B. Sodium ethanoate and hydrogen

C. Ethanol and water

D. Ethene and water

Question 74: The reaction of ethanoic acid with carbonates and hydrogencarbonates yields:

A. A salt, carbon dioxide, and water

B. An ester, carbon dioxide, and water

C. An alcohol, carbon dioxide, and water

D. None of the above

Question 75: Which gas is evolved when ethanol reacts with sodium?

A. Oxygen

B. Hydrogen

C. Carbon dioxide

D. Nitrogen

Some Important Carbon Compounds – Ethanol and Ethanoic Acid – Carbon and its Compounds MCQ

Question 76: Which of the following is a property of ethanol?

A. It is a gas at room temperature

B. It is insoluble in water

C. It is a good solvent

D. It has a high melting point

Question 77: Consumption of small quantities of dilute ethanol causes:

A. Drunkenness

B. Blindness

C. Death

D. None of the above

Question 78: Which of the following can be lethal even in small quantities?

A. Dilute ethanol

B. Pure ethanol (absolute alcohol)

C. Methanol

D. Both B and C

Question 79: Long-term alcohol consumption can cause:

A. Health problems

B. Improved coordination

C. Enhanced mental clarity

D. None of the above

Question 80: The reaction of ethanol with excess concentrated sulfuric acid at 443 K produces:

A. Ethane

B. Ethene

C. Ethanoic acid

D. Methanol

Question 81: Concentrated sulfuric acid acts as a:

A. Dehydrating agent

B. Oxidizing agent

C. Reducing agent

D. Catalyst

Question 82: Methanol is oxidized to \_\_\_\_\_ in the liver

A. Methanal

B. Ethanol

C. Ethanoic acid

D. Methanoic acid

Question 83: Ethanol is made unfit for drinking by adding poisonous substances like methanol. This is called

A. Absolute Alcohol

B. Glacial Acetic acid

C. Denatured alcohol

D. Vinegar

Question 84: Esters react with sodium hydroxide to produce alcohol and sodium salt of carboxylic acid. This reaction is known as

A. Esterification

B. Saponification

C. Hydrogenation

D. Combustion

Question 85: Which of the following countries uses alcohol as an additive in petrol?

A. India

B. Brazil

C. United States

D. Russia

Soaps and detergents – Carbon and its Compounds MCQ

Question 86: The cleaning action of soap is based on:

A. Micelle formation and emulsification

B. Hydrogenation

C. Oxidation

D. Combustion

Question 87: What causes hardness in water?

A. Presence of sodium and potassium salts

B. Presence of calcium and magnesium salts

C. Presence of detergents

D. Presence of soap

Question 88: How does hard water affect soap’s effectiveness?

A. It enhances the cleaning action of soap

B. It reduces the cleaning action of soap

C. It has no effect on soap

D. None of the above

Question 89: What are detergents?

A. Sodium or potassium salts of long-chain carboxylic acids

B. Sodium salts of sulphonic acids or ammonium salts with chlorides or bromides ions

C. Esters of long-chain carboxylic acids

D. None of the above

Question 90: Which of the following statements is true about detergents?

A. They form insoluble precipitates with calcium and magnesium ions

B. They are ineffective in hard water

C. They remain effective in hard water

D. None of the above

Question 91: Detergents are commonly used in:

A. Shampoos

B. Laundry detergents

C. Dishwashing liquids

D. All of the above

Question 92: Which part of a soap molecule interacts with water?

A. The ionic end

B. The carbon chain

C. Both the ionic end and the carbon chain

D. Neither the ionic end nor the carbon chain

Question 93: Which part of a soap molecule interacts with oil?

A. The ionic end

B. The carbon chain

C. Both the ionic end and the carbon chain

D. Neither the ionic end nor the carbon chain

Question 94: What structures are formed when soap molecules interact with oil droplets in water?

A. Micelles

B. Emulsions

C. Suspensions

D. Solutions

Question 95: How do micelles help in cleaning?

A. They dissolve the oil in water

B. They break down the oil into smaller molecules

C. They trap the oil inside and allow it to be washed away

D. None of the above

Question 96: Why does a soap solution appear cloudy?

A. It forms a true solution

B. It forms a suspension

C. The micelles are large enough to scatter light

D. None of the above

Question 97: Which of the following is NOT a method to wash clothes?

A. Beating the clothes on a stone

B. Scrubbing with a brush

C. Agitating in a washing machine

D. Soaking in cold water without agitation

Question 98: Why is agitation necessary to get clean clothes?

A. It helps dissolve the soap in water

B. It increases the temperature of the water

C. It helps the soap/detergent molecules interact with the dirt and remove it

D. None of the above

Question 99: What is scum?

A. An insoluble substance formed by the reaction of soap with hard water

B. A soluble substance formed by the reaction of detergent with hard water

C. A type of micelle

D. None of the above

Question 100: Which of the following cleaning agents is more effective in hard water?

A. Soap

B. Detergent

C. Both are equally effective

D. Neither is effective

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