C2.6 Carbon and its Compounds 1. Fullerene is a synthetic allotrope of carbon. True or False FALSEMaybeTRUENone 2. What is observed when a mixture of carbon and some metals oxides are heated? Carbon has the ability to remove combined oxygen from some metals hence carbon is oxidized to carbon (IV) oxide and the metal oxides are reduced to metalsCarbon can be placed in the reactivity series of metals between Aluminum and Zinc thus it reduces the oxides of metals below its reactivity seriesCarbon is a reducing agent because it reduces metal oxides to metals.All of the above 3. Name the allotrope of carbon which is stable, colorless, transparent and shiny crystalline solid SilverGraphiteDiamondSodium 4. Describe Carbon (IV) oxide gas It is the most stable oxide of carbonIt’s made up with one carbon atom bonding with two oxygen atom in a strong covalent bondIt is a molecular structureAll of the above 5. Describe Carbon (Ii) oxide Its an oxide of carbon It is formed by one carbon atom forms 3 covalent bonds with one oxygen atom. C= OIt is a molecular structureAll of the above 6. Mention the two common allotropes of carbon DiamondSilverGraphiteBoth and C 7. Allotropy is the existence of an element in more than one form in the same physical state. True or False FALSEMaybeTRUENone 8. What is the action of heat on carbonates and hydrogen carbonates? All carbonates except the carbonates of potassium and sodium decompose to produce a metal oxide and carbon (IV) oxideAmmonium carbonates decompose when heated to produce ammonia, carbon (IV) oxide and waterHydrogen carbonates decompose on heating to produce a carbonate, carbon (IV) oxide and waterAll of the above 9. Explain the products formed when carbonates and hydrogen carbonates react with dilute acids They form of Salt and Water and Carbon (IV) oxideThe reaction of Calcium carbonate and dilute sulphuric acid does not go to completion due to the formation of insoluble calcium sulphate.The reaction of Lead carbonate and dilute Sulphuric acid does not go to completion due to the formation of insoluble Lead sulphateAll of the above 10. Describe the characteristics of Diamond Its carbon uses all the 4 valence electrons to form covalent bondsIt uses all the four electrons in the outermost energy level for bonding hence it lacks any delocalized electrons thus diamond does not conduct electricityDiamond has a high melting point due to the strong covalent bonds in the structure.All of the above 11. Describe the characteristics of Graphite Its carbon atom uses only 3 valence electrons to be bonded with 3 carbon atomsIt uses 3 valence electrons in the outermost energy level leaving one electron which is not used in bonding hence having delocalized electron in its structure thus graphite is able to conduct electricityIt has a high melting and boiling point because of the strong covalent bonds between the atoms in the layersAll of the above 12. Mention the properties of Carbon (IV) oxide gas It is a colorless, odorless gas and denser than air hence collected by downward deliveryIt does not support combustion and turns the universal indicator redWhen Carbon (IV) oxide is bubbled in Calcium hydroxide a white precipitate is formed to confirm the presence of Carbon (IV) oxide gasAll of the above 13. Which allotrope of carbon has a giant atomic structure in which carbon atom is bonded to four other carbon atoms to form a regular tetrahedron shape? SilverGraphiteDiamondNone 14. How is carbon (IV) oxide prepared in the Lab? Reacting a metal carbonate and an acid to form salt, water and carbon (IV) oxide gasCalcium carbonate reacts with an acid to form Calcium Chloride and water and Carbon (IV) oxide gas. { CaCO3 (S) + 2HCl (aq) = CaCl2 (aq) + CO2 (g) + H2O (l) }Carbon (IV) oxide gas is passed through water to remove traces of hydrochloric acid and then passed through a drying agent anhydrous Calcium Chloride when required dryAll of the above 15. How does Carbon react with concentrated Nitric (V) acid? Carbon will act as a reducing agentCarbon reduces hot concentrated nitric (V) acid to Nitrogen (IV) oxide gas and waterCarbon is oxidized to Carbon (IV) oxide gasAll of the above 16. Mention the chemical properties of carbon (II) oxide Carbon (II) Oxide is burned in oxygen to form Carbon (IV) oxide gasCarbon (II) oxide is a reducing agent to metals low in the reactivity series i.e. copper, lead and iron and in turn it is oxidized to carbon (IV) oxide gasCarbon (II) oxide burns in air with a blue flameAll of the above 17. What makes graphite a good lubricant of fast-moving machines which generate a lot of heat? It has delocalized electronsIt has a high melting point and it’s slippery in nature.Because its carbon layers can slide over each otherNone of the mentioned 18. Carbonates are salts of metal ions or ammonium ions with carbonate ions. True or False FALSEMaybeTRUENone 19. What is formed when carbon burns in oxygen? A colorless gas is produced which is Carbon (IV) oxide { C(S) + O2 (g) = CO2 (g) }It forms a gas that reacts with Calcium hydroxide to form a white precipitate Calcium carbonate and water. { CO2 (g) + Ca(OH)2 (aq) = CaCO3(S) + H2O(l) }It forms a colorless gas Carbon (IV) oxide which puts out a glowing splintAll of the above 20. Which allotrope of carbon has a giant atomic structure in which layers are held together by Van der Waals forces? SilverDiamondGraphiteSodium 21. Mention the uses of Carbon (IV) oxide Used as a refrigerating agent for perishable goods since solid carbon (IV) oxide it sublimes when heated leaving no residueUsed in portable fire extinguishers to put out the fire since it doesn’t support combustionCarbon (IV) oxide is dissolved in water to make aerated drinks to add taste.All of the above 22. An impure form of carbon is called AllotropeFullerenesAmorphous i.e. charcoal None of the mentioned 23. What makes graphite a good conductor of electricity and a good electrode? It has delocalized electrons in its structure It has a high melting point and slippery in natureBecause its carbon layers can slide over each otherNone of the mentioned 24. Which of the following is not an example of amorphous carbon? CharcoalCoalCokeDiamond 25. How does Carbon react with concentrated sulphuric acid? Carbon will react as a reducing agentCarbon reduces hot concentrated Sulphuric acid to Sulphur (IV) oxide and water.Carbon is oxidized to Carbon (IV) oxide gasAll of the above 26. Name the allotrope of carbon which is black, soft and slippery crystalline solid SilverSodiumDiamondGraphite 27. Describe the physical properties of Carbon (II) Oxide. It is colorless, odorless and slightly less dense than air.It has a low boiling point because of the weak forces of attraction between the moleculesThe gas is extremely poisonous it combines with hemoglobin to form stable carboxy-hemoglobin leading to suffocationAll of the above 28. How is Carbon (II) oxide produced in the Lab? By dehydrating Methanoic acid using concentrated Sulphuric (VI) acid? { Methanoic acid Conc. Sulphuric acid Carbon(II) oxide + Water }By dehydrating Ethanedioic acid using concentrated Sulphuric acid {Ethanedioic acid Conc. H2SO4 Carbon (II) Oxide + Water}Passing Carbon (IV) oxide over heated charcoal {Carbon (IV) Oxide + Carbon 2CO(g) }All of the above Loading...
Name the allotrope of carbon which is stable, colorless, transparent and shiny crystalline solid
