CLASS 8 CHEMISTRY : Carbon

What is the phenomenon where an element exists in multiple forms in the same physical state, but with differing physical properties?

In what unit is the weight of a diamond typically expressed?

What term describes the self-linking property of carbon atoms to form long chains?

Which form of carbon is known for its rigid tetrahedral structure, making it very hard?

Which of the following is a use of graphite?

What process is defined as the slow conversion of vegetable matter into carbon-rich substances?

What is the property which describes a substance absorbing gases, liquids, or solids only on its surface?

What is the term for heating a substance in the absence of air, leading to its decomposition?

Which type of charcoal is known for its high adsorbing capacity and is used in water filters?

Which type of coal has the highest carbon content?

Which of the following is a use of coke?

What is bone charcoal primarily used for?

What is the primary use of lamp black?

What chemicals are used for the preparation of carbon dioxide in the laboratory?

What happens when a lit splinter is inserted into a jar containing carbon dioxide?

What does carbon dioxide do to moist blue litmus paper?

For what purpose is solid carbon dioxide (dry ice) primarily used?

What is the trapping of the earth's radiated energy by carbon dioxide called?

What toxic gas is produced as a result of incomplete combustion of fuels?

What is the immediate remedy for carbon monoxide poisoning?

Which of the following best explains why graphite conducts electricity, while diamond does not?

If a diamond cutter uses an impure diamond to cut another diamond, which property of the impure diamond is being utilized?

How does the carbonization process contribute to the formation of different types of coal?

Why is wood charcoal used in water filters and gas masks, instead of other forms of carbon?

What distinguishes anthracite from other types of coal regarding its composition and use?

In the context of fire extinguishers, what is the key advantage of using liquid carbon dioxide over soda-acid solutions?

How would the extensive deforestation impact the concentration of carbon dioxide in the atmosphere and the earth's temperature?

What is the role of carbon monoxide in reducing metal oxides, and what happens to the carbon monoxide itself during the process?

Why is carbon monoxide considered a 'silent killer'?

How does carbon monoxide inhibit the body's ability to transport oxygen?

What is the underlying principle behind the greenhouse effect, and how does carbon dioxide contribute to it?

What is the chemical reason that dilute hydrochloric acid, and not dilute sulphuric acid, is preferred for preparing carbon dioxide from marble chips in the laboratory?

Considering the properties of carbon dioxide, why does it extinguish a lit splinter?

Why is sugar charcoal preferred over wood charcoal for preparing artificial diamonds?

How does applying artificial respiration with carbogen (oxygen and carbon dioxide mixture) help in treating carbon monoxide poisoning?

What role does bone charcoal play in the sugar manufacturing process, and what property makes it suitable for this purpose?

Why does passing excess carbon dioxide through lime water cause the milkiness to disappear?

Considering the formation of coal, what environmental conditions are essential for the transformation of decayed vegetable matter into coal?

During the destructive distillation of coal, various substances are produced. Which of these substances is primarily used as a fuel?

Bone charcoal is used to remove excess fluoride from water. What is a consequence of excess fluoride intake?

Allotropes of an element have identical physical properties.

One carat is equivalent to 0.2 grams.

Crystals have a definite geometrical shape.

Catenation is the property of carbon atoms to link together.

Diamond conducts electricity due to the presence of mobile electrons.

In diamond, each carbon atom is linked to five neighboring carbon atoms.

Fullerenes are a non-crystalline form of carbon.

Graphite is used for making insulators.

Diamonds can be used to cut other diamonds.

Carbonization is the rapid conversion of vegetable matter into carbon-rich substances.

Adsorption involves a substance being absorbed throughout the bulk of another material.

Bone charcoal is treated with sulfuric acid to separate the carbon content.

Destructive distillation involves heating a substance in the presence of oxygen.

Wood charcoal is prepared by burning wood in the open air

Coal formation involves the decomposition of vegetable matter over millions of years.

Anthracite coal contains the lowest percentage of carbon.

Coke is used as a reducing agent to extract metals.

Carbon dioxide is collected by downward displacement of air.

Carbon dioxide supports combustion.

Carbon monoxide increases the blood's ability to carry oxygen.

Allotropes of an element maintain identical physical properties but differ in their chemical behavior.

A diamond weighing 500 mg is equivalent to 5 carats.

Amorphous solids, like glass, possess long-range order, giving them distinct geometrical shapes and plane surfaces.

The catenation ability of carbon is primarily attributed to its small size and high electronegativity.

In graphite, all valence electrons are involved in sigma bond formation, which accounts for its high electrical conductivity.

Each carbon atom in diamond is bonded to five neighboring carbon atoms in a trigonal bipyramidal geometry.

Buckyballs are a form of amorphous carbon, lacking any regular repeating structure.

Graphite's primary use in pencils relies on its extreme hardness, allowing it to scratch paper.

Diamonds are exclusively used for aesthetic purposes in jewelry due to their high refractive index and brilliance.

Carbonization is the rapid oxidation of organic matter at high temperatures.

Absorption is a surface phenomenon where molecules of a substance adhere to the surface of a solid or liquid.

Bone black, used as a pigment, is produced by dissolving calcium carbonate from bone charcoal using nitric acid.

Sublimation involves heating a substance in the presence of air, causing it to decompose into its constituent substances.

Sugar charcoal's low adsorbing capacity makes it unsuitable for use in gas masks or water filters.

The formation of coal involves the decomposition of ancient marine life under immense pressure and temperature.

Anthracite coal contains the lowest percentage of carbon compared to other types of coal.

Coke is primarily used as a raw material in the production of synthetic diamonds due to its purity.

Dilute nitric acid is the preferred acid for reacting with marble chips in the lab preparation of carbon dioxide.

Carbon dioxide supports combustion, making it ideal for use in fire extinguishers.

The greenhouse effect is solely detrimental, leading only to global warming and related environmental issues.

Allotropes of an element in the same physical state exhibit identical physical properties but may differ in chemical reactivity.

In diamond, each carbon atom is linked to four neighboring carbon atoms, resulting in a flexible planar structure.

Catenation is exclusive to carbon; no other element can form long chains of atoms.

Adsorption involves a substance penetrating the inner layers of another material, causing a change in volume.

Destructive distillation of coal primarily yields oxygen, hydrogen, and pure carbon as the major products.

Anthracite coal, with its lower carbon content compared to peat, is less efficient as a fuel source.

Carbon dioxide extinguishers are ineffective on electrical fires due to the conductive nature of carbon dioxide.

The sole consequence of the greenhouse effect is detrimental global warming, with no beneficial aspects.

The reaction between calcium carbonate and dilute sulfuric acid proceeds continuously, producing a high yield of carbon dioxide without any inhibition.

Carbon monoxide primarily affects the digestive system, leading to digestive complications and nutritional deficiencies.

______ is the phenomenon due to which an element exists in two or more forms in the same physical state.

The weight of a diamond is expressed in terms of ______, where 1 carat = 0.2 g.

______ atom possess a unique property to link themselves together to form very long chains.

In graphite, one valence electron of each carbon atom remains free, so it is a good ______ of electricity.

In diamond, each carbon atom is linked with four neighboring carbon atoms forming a rigid ______ structure.

______ are the third crystalline form of carbon, with carbon atoms held together in a cage-like structure.

Graphite is used for making the ______ of electric furnaces.

Diamonds are used in ______ as a gem.

Impure diamond is used to cut and drill rocks, glass, or other ______.

The process of slow conversion of vegetable matter into carbon-rich substances is called ______.

______ is the property due to which a substance absorbs gases, liquids, and solids only on its surface.

When a substance is heated in the absence of air, the process is called ______ distillation.

______ charcoal has high adsorbing capacity, so it is used in water filters to remove impurities.

The process of formation of coal is known as ______, which took millions of years.

______ is a type of coal that contains about 50 to 60% carbon.

______ is used both as a domestic and industrial fuel.

______ charcoal is an important constituent of gun powder.

______ charcoal is used to decolourise cane sugar in the process of manufacturing sugar.

Marble chips and dilute hydrochloric acid are the chemicals required for the preparation of ______ in the laboratory.

Carbon dioxide gas traps the long wave reflected radiations of sun and keeps our earth ______.

[Blank] is defined as the phenomenon due to which an element exists in two or more forms in the same physical state with identical chemical properties but with different physical properties.

A ______ is a homogeneous solid in which particles are arranged in a definite pattern, giving it a definite geometrical shape with plane surfaces.

[Blank] is the unique property of carbon atoms to link themselves together, forming long chains of different sizes that may be straight, branched, or cyclic.

In a graphite molecule, one valence electron of each carbon atom remains free, making graphite a good conductor of ______.

In diamond, each carbon atom is linked with four neighboring carbon atoms, forming a rigid ______ structure, which results in diamond's hardness.

[Blank] are the third crystalline form of carbon, where many carbon atoms are held together in a cage-like structure.

Graphite is used for making the electrodes of electric furnaces and for manufacturing ______.

Impure diamond is used to cut and drill rocks, glass, or other diamonds, while purer forms are valued in ______.

[Blank] is the property of a substance to attract and hold gases, liquids, or solids onto its surface.

Bone black or ivory black is produced by treating bone charcoal with hydrochloric acid to separate the carbon content after dissolving ______.

[Blank] is the process of heating a substance in the absence of air, leading to its decomposition into constituent substances such as coke, coal tar, and coal gas.

Wood charcoal is used in water filters to remove impurities and in gas masks to adsorb harmful gases due to its high ______ capacity.

Peat, lignite, bituminous, and anthracite are the four types of ______, distinguished by their carbon content and formation process.

Coke is used in the manufacture of water gas ($CO + H_2$), producer gas ($CO + N_2$), as well as in the production of artificial ______.

Sugar charcoal is primarily utilized as a reducing agent to extract metals from their respective oxides and in the preparation of artificial ______.

The reaction between marble chips ($CaCO_3$) and dilute hydrochloric acid ($HCl$) produces calcium chloride ($CaCl_2$), water ($H_2O$), and ______ ($CO_2$).

When carbon dioxide gas is passed through lime water, it turns milky due to the formation of insoluble ______.

[Blank] serves as a coolant and refrigerant for food items like fruits, vegetables, and meat, which helps prevent their spoilage.

The unique property of carbon atoms to link themselves together forming long chains is called ______.

While graphite conducts electricity due to free valence electrons, ______ does not because it lacks mobile electrons.

[Blank] is the process by which vegetable matter slowly converts into carbon-rich substances.

[Blank] is the property of a substance to absorb gases, liquids, or solids on its surface.

Heating a substance in the absence of air is known as ______, which decomposes the substance into its constituents.

The type of coal with the highest carbon content (92-98%) is ______.

The reaction between dilute sulfuric acid and marble chips is limited because the formed ______ is insoluble and stops the reaction.

When excess carbon dioxide is passed through lime water, the milkiness disappears due to the formation of soluble ______.

Carbon monoxide is lethal because it forms a stable compound called ______ in the blood, preventing oxygen transport.

The phenomenon where carbon dioxide traps heat, keeping Earth warm, is known as the ______.

What is the phenomenon called when an element exists in multiple forms with the same physical state?

What unit is used to measure the weight of a diamond?

What type of solid has particles arranged in a definite repeating pattern?

What is the property of carbon that allows it to form long chains?

Which form of carbon is a good conductor of electricity?

Why is diamond so hard?

What is the cage-like form of carbon called?

Name one use of graphite.

Name one use of diamonds.

What is the slow conversion of vegetable matter into carbon-rich substances called?

What is the property called when a substance absorbs gases, liquids, or solids on its surface?

What is wood charcoal used for due to its high adsorbing capacity?

What is the process of heating a substance in the absence of air called?

What is the type of coal with the highest carbon content?

What type of charcoal is used to decolourise cane sugar?

What two chemicals are required for the preparation of carbon dioxide in the laboratory?

What happens to a lit splinter in a jar containing carbon dioxide?

What happens when carbon dioxide is passed through lime water?

What is solid carbon dioxide commonly known as?

Explain how the structure of graphite contributes to its ability to conduct electricity.

Describe the tetrahedral arrangement of carbon atoms in a diamond and relate it to diamond's hardness.

What is catenation, and why is it significant in carbon chemistry?

Explain the process of carbonization and its role in the formation of coal.

How does the carbon content vary among the different types of coal (peat, lignite, bituminous, and anthracite)? Arrange them in increasing order of carbon content.

Describe the advantage of using wood charcoal in water filters, relating it to its adsorbing capacity.

Explain why dilute hydrochloric acid, rather than dilute sulfuric acid, is preferred for preparing carbon dioxide from marble chips in the laboratory.

Explain why carbon dioxide turns moist blue litmus paper red, and what this indicates about the nature of the gas.

Describe the effect of carbon dioxide on lime water when the gas is passed through it in small amounts and then in excess.

How does carbon dioxide contribute to the greenhouse effect, and what are the potential consequences of an increased greenhouse effect?

Explain why modern fire extinguishers using liquid carbon dioxide are safer for extinguishing electrical fires compared to soda-acid fire extinguishers.

How does carbon monoxide interfere with the ability of blood to carry oxygen, and what is the resulting effect on the body?

Why is carbon monoxide referred to as a 'silent killer'?

Explain the importance of providing artificial respiration with carbogen (a mixture of oxygen and carbon dioxide) as a remedy for carbon monoxide poisoning.

Describe how destructive distillation is used to process coal and list two of the major products obtained from this process.

Explain how adsorption is related to the use of bone charcoal in the process of sugar refining.

Compare and contrast the uses of coke and sugar charcoal, highlighting their applications in either fuel production or metal extraction.

What are the benefits of the greenhouse effect, and how does global warming disrupt these benefits?

Describe how the structure and properties of fullerenes differ from those of diamond and graphite.

Explain why solid carbon dioxide (dry ice) is used for refrigeration, particularly for perishable goods like fruits and vegetables.

How does the unique tetrahedral structure of diamond contribute to its distinct physical property, and why can this property be crucial for specific industrial applications?

Explain the significance of graphite's ability to conduct electricity in the context of its layered structure and delocalized electrons. How does this compare to diamond's electrical conductivity?

Describe the process of carbonization and explain how varying conditions influence the formation of different types of coal from ancient vegetable matter.

Relate the adsorbing capacity of wood charcoal to its uses in gas masks and water filters. What specific properties of wood charcoal make it suitable for these applications?

Explain how the use of dilute sulfuric acid in the production of carbon dioxide can be problematic, and why hydrochloric acid is preferred. Provide the relevant chemical equations to support your explanation.

Describe the chemical process involved when carbon dioxide turns lime water milky and explain why the milkiness disappears with excess carbon dioxide. Include relevant chemical equations.

Discuss why soda-acid fire extinguishers are not suitable for oil or electrical fires, contrasting this with modern $CO_2$ extinguishers. Explain the underlying principles.

Explain how carbon monoxide ($CO$) acts as a 'silent killer' in poorly ventilated rooms with burning fuel. Detail the biochemical mechanism that makes it so dangerous.

Describe how carbon monoxide can be utilized as a reducing agent in metallurgy. Provide a balanced chemical equation illustrating this process with a metal oxide of your choice.

Differentiate between the processes of adsorption and absorption, and explain how wood charcoal's structure facilitates one of these processes, making it useful in applications like gas masks.

Compare and contrast the electrical conductivity of diamond and graphite in terms of their atomic structure and bonding. How does the presence or absence of free electrons influence their conductive properties?

Explain why heating calcium carbonate ($CaCO_3$) with dilute sulfuric acid ($H_2SO_4$) eventually stops the production of carbon dioxide, whereas hydrochloric acid ($HCl$) continues to produce carbon dioxide. Write the balanced chemical equations for both reactions.

Describe the process of carbonization and explain how the percentage of carbon content varies among peat, lignite, bituminous coal, and anthracite. Arrange these types of coal in terms of increasing carbon content.

Formulate an argument explaining the dual role of carbon dioxide in Earth’s atmosphere, acting both as a necessary component for life and as a potential pollutant leading to global warming.

Explain the chemical process behind carbon monoxide poisoning, detailing how it affects the body's ability to transport oxygen and why it is called a 'silent killer'.

Describe the differences between soda-acid, foam-type, and modern liquid carbon dioxide fire extinguishers. Focus on each type's suitability of use for oil and electrical fires.

Discuss the significance of destructive distillation of coal and identify the primary products obtained. For each product, list one major application.

Outline the steps involved in locally preparing wood charcoal, emphasizing the importance of controlled airflow and the byproducts formed during the process.

Explain the process of adsorption and describe how wood charcoal and bone charcoal function in water purification and sugar decolorization, respectively.

Illustrate with chemical equations how carbon monoxide acts as a reducing agent, providing one example using a metal oxide. Explain its role in metallurgical processes.