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. 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 6 2 None 2. 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. 2 and 3 1 and 2 1 and 4 All of them None 3. Which pollutant gas can be produced as a result of incomplete combustion of octane (C8 H18)? Carbon Carbon monoxide Carbon dioxide Methane None 4. The chlorination of methane is an example of: elimination None of the above substitution addition None 5. Ethanol reacts with sodium and forms two products. These are sodium ethanoate and hydrogen sodium ethanoate and oxygen sodium ethoxide and hydrogen sodium ethoxide and oxygen None 6. 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 : methanoic acid; CO2 ethanoic acid; CO2 ethanoic acid; H2 methanoic acid; H2 None 7. Which of the following statements are correct? Unsaturated hydrocarbons add hydrogen to give saturated hydrocarbons. Catalysts are used for addition reactions of unsaturated hydrocarbons. Hydrogenation of vegetable oils is an example of addition reaction. All of the above None 8. When two pairs of electrons are shared, bond is Double covalent bond Single covalent bond Triple bond Dative bond None 9. 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 true and reason is the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. None 10. Washing soaps produce scum with hard water and not much foam because hard water contains: chalk and sulphur many dissolved inorganic salts organic matter many suspended particles None 11. 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 and reason both are correct statements and reason is the correct explanation for assertion. Assertion is a correct statement but the reason is the wrong statement. None 12. ______ is the perfectly crystalline allotrope of carbon. Coke Coal Wood Diamond None 13. In a covalent bond formation: sharing of electrons between two atoms takes place electrons are donated by one atom and shared by both atoms. electrons are shared by one atom only transfer of electrons takes place None 14. While cooking, if the bottom of the vessel is getting blackened on the outside, it means that: the food is not cooked completely. the fuel is not burning completely. the fuel is burning completely. the fuel is wet. None 15. 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 electrochemicals series a homologous series a homogeneous series None 16. Identify the unsaturated compounds from the following(i) Propane(ii) Propene(iii) Propyne(iv) Chloropropane (ii) and (iv) (ii) and (iii) (iii) and (iv) (i) and (ii) None 17. In the presence of the acid catalyst, ethanoic acid reacts with ethanol to produce________. ethyl ethanote ethanol ethyl ethanol ethanoic None 18. Which of the given statements is true? The ionic end of soap and the carbon chain both dissolve in water. 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 dissolves in oil while the carbon chain dissolves in water. None 19. The number of carbon compounds is very large because: it shows allotropy it has non- metallic character it has strong catenation property. carbon is tetra-valent None 20. Which statement about bonding is not correct? Hydrogen molecules have the formula H2 . Chlorine atoms react to gain a noble gas electronic configuration. Covalent bonding involves losing and gaining electrons. Carbon can form covalent bonds. 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.
