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CLASS - X, SUBJECT- CHEMISTRY, , TOPIC- CHAP. 4, Carbon and its compound., Date- 5/01/2022, , 1. Which of the following statements are correct for carbon compounds?, (i) Most carbon compounds are good conductors of electricity., (ii) Most carbon compounds are poor conductors of electricity., (iii) Force of attraction between molecules of carbon compounds is not very strong., (iv) Force of attraction between molecules of carbon compounds is very strong., (a) (ii) and (iv), (b) (ii) and (iii), (c) (i) and (iv), (d) (i) and (iii), 2. Why does carbon form compounds mainly by covalent bonding?, (a) There are four electrons in the outermost shell of carbon., (b) It requires large amount of energy to form C4+ or C-4., (c) It shares its valence electrons to complete its octet., (d) All the above, 3. Which of the following belongs to homologous series of alkynes?, C6H6, C2H6, C2H4, C3H4., (a) C6H6, (b) C2H4, (C) C2H6, (d) C3H4, 4. A hydrocarbon has four carbon atoms. Give its molecular formula if it is an, alkene., (a) C4H10, (b) C4H8, (C) C4H6, (d) C4H4, 5. The first member of the alkyne homologous series is, (a) propyne, (b) ethyne, (c) methane, (d) ethene, 6. In diamond, each carbon atom is bonded to four other carbon atoms to form, (a) a hexagonal array, (b) a rigid three-dimensional structure, (c) a structure in the shape of a football, (d) a structure of a ring, 7. Carbon exists in the atmosphere in the form of, (a) carbon monoxide only, (b) carbon monoxide in traces and carbon dioxide, (c) carbon dioxide only, (d) coal, 8. Graphite is used as a lubricant in machines because, (a) it is a good conductor of electricity., (b) it has a high melting point and slippery layers., (c) its density ranges from 1.9 to 2.3 g/cm3., (d) it is strong and soft.
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9. The allotrope of carbon which is a good conductor of heat and electricity is, (a) diamond, (b) graphite, (c) charcoal, (d) none of these, 10. Which of the following is not considered as crystalline allotrope of carbon?, (a) Coal, (b) Diamond, (c) Graphite, (d) Fullerene, 11. Which among the following are unsaturated hydrocarbons?, , (a) (i) and (iii), (b) (ii) and (iii), (c) (ii) and (iv), (d) (iii) and (iv), 12. Structural formula of ethyne is, , Ans- option A, 13. The portion left on dropping a hydrogen atom from an alkane is called, (a) functional group, (b) alkenyl group, (c) alkyl group, (d) phenyl group, 14. Identify the unsaturated compounds from the following:, (i) Propane, (ii) Propene, (iii) Propyne, (iv) Chloropropane, (a) (i) and (ii), (b) (ii) and (iv), (c) (iii) and (iv), (d) (ii) and (iii)
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15. Which of the following are correct structural isomers of butane?, , (a) (i) and (iii), (b) (ii) and (iv), (c) (i) and (ii), (d) (iii) and (iv), 16. Carbon forms four covalent bonds by sharing its four valence electrons with four, univalent atoms, e.g., hydrogen. After the formation of four bonds, carbon attains, the electronic configuration of, (a) helium, (b) neon, (c) argon, (d) krypton, 17. Which of the following statements are usually correct for carbon compounds?, These, (i) are good conductors of electricity, (ii) are poor conductors of electricity, (iii) have strong forces of attraction between their molecules, (iv) do not have strong forces of attraction between their molecules, (a) (i) and (iii), (b) (ii) and (iii), (c) (i) and (iv), (d) (ii) and (iv), 18. Pentane has the molecular formula C5H12. It has, (a) 5 covalent bonds, (b) 12 covalent bonds, (c) 16 covalent bonds, (d) 17 covalent bonds, 19. Hydrocarbons are mainly composed of which of these?, (a) Hydrogen, carbon and nitrogen, (b) Hydrogen and carbon, (c) Hydrogen, (d) Hydrogen, oxygen and carbon, 20. How many double bonds are there in a saturated hydrocarbon?, (a) One, (b) Two
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(c) Three, (d) Zero, 21. Successive members of a homologous series vary by how many atomic mass, unit?, (a) Sixteen, (b) Fourteen, (c) One, (d) Twelve, 22. Which of these is not an organic acid?, (a) Acetic acid, (b) Tartaric acid, (c) Nitric acid, (d) Formic acid, 23. The electronic configuration of an element is found to be 2, 4. How many bonds, can one carbon atom form in a compound?, (a) 1, (b) 2, (c) 4, (d) 6, 24. The image represents the structure of a carbon compound known as ethane., , Which option explains the naming of ethane?, (a) the presence of functional group connected with a single bond, (b) as it contains two carbon atoms and a single bond connects the carbon atoms, (c) carbon compound with a total number of eight atoms are named as ethane, (d) as it contains six hydrogen atoms and a single bond connects the carbon and hydrogen atom, 25. A carbon compound contains two atoms of carbon. Which name should the carbon, compound bear?, (a) Butane, (b) Ethane, (c) Methane, (d) Propane, 26. Methane, ethane and propane are said to form a homologous series because all are(a) Hydrocarbons, (b) saturated compounds
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(c) aliphatic compounds, (d) differ from each other by a CH2 group, 27. Choose the correct statement, (a) The ethene molecule is made up of 2 carbon atoms and 4 hydrogen atoms., (b) Each carbon atom shares three electrons with three hydrogen atoms to form three carbonhydrogen single covalent bonds., (c) In ethane, the two carbon atoms share one pair of electrons among themselves to form one, carbon-carbon single covalent bond., (d) All the above., 28. Following is (are) the property(ies) of ionic compounds., (a) They have high melting and boiling points, (b) They conduct electricity in solution or in molten state, (c) Both (a) and (b), (d) None of the above., 29. Which of the following is not a characteristic of fullerenes?, (a) Of all the fullerene, C60 allotrope is the most stable., (b) Its shape is similar to that of a soccer ball., (c) It contains only fused six-membered carbon-carbon rings., (d) Its hardness is lower than that of diamond., Q30. A hydrocarbon should have a minimum of how many carbon atoms to show, isomerism?, (a) Three, (b) Four, (c) Fived, (d) Six
