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