Ncert – class 10- science -Chapter 4 – Carbon and Its Compounds 2 Welcome to your Ncert - class 10- science -Chapter 4 – Carbon and Its Compounds 2 1. ______ is the perfectly crystalline allotrope of carbon. Coal Coke Wood Diamond None 2. Which of the given statements is true? The ionic end of soap and the carbon chain both dissolve in oil. The ionic end of soap dissolves in water while the carbon chain dissolves in oil. The ionic end of soap and the carbon chain both dissolve in water. The ionic end of soap dissolves in oil while the carbon chain dissolves in water. None 3. An organic compound 'A' produces a gas with brisk effervescence when sodium bicarbonate is added to it. The compound 'A' contains the same number of carbons as in ethane. The compound 'A' reacts with ethanol to form a sweet-smelling compound 'C' in presence of conc. H2SO4 acid. Then the name of compound A and the gas evolved is : ethanoic acid; CO2 ethanoic acid; H2 methanoic acid; CO2 methanoic acid; H2 None 4. The number of carbon compounds is very large because: carbon is tetra-valent it has strong catenation property. it shows allotropy it has non- metallic character None 5. Which of the following statement(s) is/are correct?(1) Graphite is used in making electrodes because it can conduct electricity.(2) Graphite is used as a solid lubricant.(3) Graphite is used in the manufacture of crucibles.(4) Graphite is also known as the black lead. 1 and 2 1 and 4 All of them 2 and 3 None 6. While cooking, if the bottom of the vessel is getting blackened on the outside, it means that: the fuel is wet. the fuel is burning completely. the food is not cooked completely. the fuel is not burning completely. None 7. Identify the unsaturated compounds from the following(i) Propane(ii) Propene(iii) Propyne(iv) Chloropropane (iii) and (iv) (ii) and (iii) (ii) and (iv) (i) and (ii) None 8. A group closely related compounds which can be expressed by a general formula & in which two consecutive members differ by 14 in their molecular masses is called: a heterogeneous series a homologous series a homogeneous series a electrochemicals series None 9. Which of the following statements are correct? Unsaturated hydrocarbons add hydrogen to give saturated hydrocarbons. Catalysts are used for addition reactions of unsaturated hydrocarbons. All of the above Hydrogenation of vegetable oils is an example of addition reaction. None 10. Assertion: When a hydrocarbon is combusted in air, carbon monoxide is always the major product.Reason: Air contains much more nitrogen than oxygen. Assertion is a wrong statement but the reason is a correct statement. Assertion and reason both are correct statements but the reason is not the correct explanation for assertion. Assertion is a correct statement but the reason is the wrong statement. Assertion and reason both are correct statements and reason is the correct explanation for assertion. None 11. Ethanol reacts with sodium and forms two products. These are sodium ethanoate and hydrogen sodium ethoxide and hydrogen sodium ethoxide and oxygen sodium ethanoate and oxygen None 12. The chlorination of methane is an example of: substitution addition None of the above elimination None 13. In a covalent bond formation: transfer of electrons takes place electrons are shared by one atom only sharing of electrons between two atoms takes place electrons are donated by one atom and shared by both atoms. None 14. Which pollutant gas can be produced as a result of incomplete combustion of octane (C8 H18)? Methane Carbon monoxide Carbon Carbon dioxide None 15. Which statement about bonding is not correct? Hydrogen molecules have the formula H2 . Covalent bonding involves losing and gaining electrons. Carbon can form covalent bonds. Chlorine atoms react to gain a noble gas electronic configuration. None 16. In the presence of the acid catalyst, ethanoic acid reacts with ethanol to produce________. ethanol ethyl ethanote ethanoic ethyl ethanol None 17. Assertion: In O/W emulsion, soap is mixed.Reason: Soap reduces surface tension. If both assertion and reason are true but reason is not the correct explanation of assertion. If both assertion and reason are false. If assertion is true but reason is false. If both assertion and reason are true and reason is the correct explanation of assertion. None 18. Washing soaps produce scum with hard water and not much foam because hard water contains: chalk and sulphur many dissolved inorganic salts many suspended particles organic matter None 19. When two pairs of electrons are shared, bond is Single covalent bond Triple bond Double covalent bond Dative bond None 20. An element X has 6 electrons in its outermost shell. Then the number of electrons shared by X with another atom to form a covalent bond is: 3 4 2 6 None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
