CBSE Class 10 Carbon & Its Compounds Unsolved MCQ

1. Which of the following is not a saturated hydrocarbon ?
   i) Cyclohexane.
   ii) Benzene.
   iii) Butane
   iv) isobutene
2. The bond between two identical non metallic atom has a pair of electron ?
   i) un equally shared between two atoms.
   ii) Transferred completely from one atom to another.
   iii) With identical spins
   iv) Unequally shared between them.
3. Covalent compounds are generally
   i) Soluble in water
   ii) Insoluble in water
   iii) Ionize in water
   iv) Hydrolyse in water
4. Propane with the molecular formula C₃H₈ has
   i) 7covalent bonds
   ii) 8 covalent bonds
   iii) 9 covalent bonds
   iv) 10 Covalent bonds.
5. A hydrocarbon reacts with ammonical cuprous chloride solution to form a red precipitate .The
   hydrocarbon is
   i)ethane
   ii)ethene
   iii)butane
   iv)1-propyne
6. Which of the following substance is added to denature Ethanol ?
   i)methanol
   ii)pyridine
   iii)copper sulphate
   iv)all of them
7. Which of the following is not an allotropic form of carbon
   i)fluorine
   ii)fullerene
   iii)diamond
   iv)graphite
8. Which of the following represents the correct decreasing order of hydrogen atoms ?
   i)alkanes , alkenes , alkynes
   ii)alkanes , alkaynes , alkenes
   iii)alkenes , alkynes , alkanes
   iv)alkynes , alkanes , alkenes
9. Detergents are sodium or potassium salts of long chain of ;-
   i)aldehydes
   ii)ketones
   iii)carboxylic acid
   iv)sulphonic acid
10. Which of the following represents the structure of N₂ Mmolecule ?
    i) N≡ N
    ii) N = N
    iii) N – N
    iv) None of the above
11. In double covalent bond there is sharing of
    i) 2 electrons
    ii) 4 electrons
    iii) 6 electrons
    iv) 3 electrons
12. Cation is formed when
    i) atom gains electrons
    ii) atom loses electrons
    iii) proton is lost by the atom
    iv) atom shared by electrons
13. The total no. of electrons that take part in forming a bond in N2 is
    i) 2
    ii) 4
    iii) 6
    iv) 10
14. Which of the following has the weakest carbon-carbon strength?
    i)C₂H₂
    ii)C₂H₄
    iii)C₂H₆
    iv)all have the same bond strength
15. Which of the following salt when dissolved in water produce hard water.
    i) calcium sulphate
    ii) magnesium bicarbonate
    iii) calcium chloride
    iv) any of the above
16. Which of the following is not a saturated hydrocarbon ?
    i) cyclohexane
    ii) benzene
    iii) butane
    iv) isobutene
17. The bond between two identical nonmetallic atom has a pair of electron ?
    i) unequally shared between two atoms
    ii) transferred completely from one atom to another
    iii) With identical spins
    iv) Equally shared between them
18. Covalent compounds are generally –
    i) Soluble in water
    ii) insoluble in water
    iii) Ionize in water
    iv) hydrolyse in water
19. Propane with molecular formula C₃H₈ has –
    i) 7 covalent bonds
    ii) 8 covalent bonds
    iii) 9 covalent bonds
    iv) 10 covalent bonds
20. A hydrocarbon reacts with ammonical cuprous chloride solution to form a red precipitate, the
    hydrocarbon is –
    i) Ethane
    ii) ethane
    iii) butane
    iv) 1-propyne
21. Which of the following substance is added to denature Ethanol?
    i) Methanol ii) pyridine
    iii) copper sulphate iv) all of these
22. Which of the following is not an allotropic form of carbon ?
    i) fluorine
    ii) fullerene
    iii) diamond
    iv) graphite
23. Which of the following represents the correct deceasing order of hydrogen atoms ?
    i) alkanes, alkenes, alkynes
    ii) alkanes, alkynes, alkenes
    iii) alkenes, alkynes, alkanes
    iv) alkynes, alkanes, alkenes
24. Detergents are sodium or potassium salts of long chain of :
    i) aldehydes
    ii) ketones
    iii) carboxylic acid
    iv) sulphonic acid
25. In double covalent bond there is a sharing of
    i) 2 electrons
    ii) 4 electrons
    iii) 6 electrons
    iv) 3 electrons
26. Cation is formed when
    i) atom gains electrons
    ii) atom losses electrons
    iii) proton is lost by the atom
    iv) atom shared by electrons
27. The total number of electrons that take part in forming a bond in N₂ is
    i) 2
    ii) 4
    iii) 6
    iv) 10
28. Which of the following has the weakest carbon-carbon strength ?
    i) C2H2
    ii) C2H4
    iii) C2H6
    iv) all have the same bond strength
29. Which of the following salt when dissolved in water produce hard water ?
    i) calcium sulphate
    ii) magnesium bicarbonate
    iii) calcium chloride
    iv) any of the above.
30. The two colours seen at the extreme ends of the pH charts are:-
    i) red and blue
    ii)red and green
    iii) green and blue
    iv) orange and green
31. Carboxylic acids on heating with P2O5 gives:-
    i) ethers
    ii) alcohol
    iii) carbonyl compounds
    iv) anhydrides
32. Synthetic flavours contain:-
    i) unsaturated acids
    ii) esters
    iii) dilute carboxylic acids
    iv) hydroxyl acids
33. Out of the following which one is used as preservative for pickle and sauces:-
    i) esters ii) acetone
    iii) aldehyde iv) acetic acid
34. Brisk effervescences produced when a pinch of Na₂CO₃ is added to CH₃COOH is due to the
    formation of :-
    i) H₂ gas ii) CO₂ gas
    iii) CO gas iv) CH₄ gas
35. When an acetic acid reacts with an alcohol in the presence of conc. H₂SO₄:-
    i) esters are formed ii) ketones are formed
    iii) aldehydes are formed iv) none of these
36. Sodium bi carbonate solution is added to dilute Ethanoic acid. It is observed that:-
    i) a gas evolves
    ii) a solid settles at the bottom
    iii) the mixture becomes vapour
    iv) the colour of the mixture becomes light Yellow
37. Ethanoic acid was added to sodium bicarbonate sol. And the gas evolved was tested with a
    burning splinter. The following four observations were reported:-
    1) the gas burns with the pop sound and the flame gets extinguished.
    2) the gas does not burn out but the splinter burns with a pop sound
    3) the flame extinguishes and the gas does not burn
    4) the gas burns with a blue flame and the splinter burns brightly.
    The correct observation is reported in:-
    i) 1
    ii) 2
    iii) 3
    iv) 4
38. 2ml of ethanoic acid was taken in each test tube 1 and 2 .A red litmus paper was introduced in test
    tube 1 and a pH paper was introduced in test tube 2. The experiment was performed by 4 students
    A, B, C, D and they reported their observation as given in the table. Student action on red action
    on litmus PH paper
    A) Turned blue turned pink
    B) Remains unchanged turned green
    C) Turned blue turned blue
    D) Remains unchanged turned pink
    The correct observation is reported in
    i) A
    ii) B
    iii) C
    iv) D
39. Acetic acid was added to a solid X kept in a Test tube. A colourless, odourless gas Y was
    evolved. The gas was passed through the lime water, which turned milky. It concludes that:-
    i) solid X is NaOH and the gas Y is CO₂
    ii) solid X is Na₂CO₃ and the gas Y is CO₂
    iii) solid X is sodium acetate and the gas y is CO₂
    iv) solid X is sodium chloride and the gas Y is CO₂
40. 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
41. 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)
42. A molecule of ammonia (NH3) has
    (a) only single bonds
    (b) only double bonds
    (c) only triple bonds
    (d) two double bonds and one single bond
43. Buckminsterfullerene is an allotropic form of
    (a) phosphorus
    (b) sulphur
    (c) carbon
    (d) tin
44. Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an
    example of
    (a) Addition reaction
    (b) Substitution reaction
    (c) Displacement reaction
    (d) Oxidation reaction
45. In which of the following compounds, — OH is the functional group?
    (a) Butanone
    (b) Butanol
    (c) Butanoic acid
    (d) Butanal
46. 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)

47. In the below given reaction, alkaline KMnO4 acts as

(a) reducing agent
(b) oxidising agent
(c) catalyst
(d) dehydrating agent

48. Structural formula of ethyne is

49. The soap molecule has a
    (a) hydrophilic head and a hydrophobic tail
    (b) hydrophobic head and a hydrophilic tail
    (c) hydrophobic head and a hydrophobic tail
    (d) hydrophilic head and a hydrophilic tail

50. Which of the following is the correct representation of electron dot structure of nitrogen?

51. 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)
52. Chlorine reacts with saturated hydrocarbons at room temperature in the
    (a) absence of sunlight
    (b) presence of sunlight
    (c) presence of water
    (d) presence of hydrochloric acid
53. In the soap micelles
    (a) the ionic end of soap is on the surface of the cluster while the carbon chain is in the interior of
    the cluster.
    (b) ionic end of soap is in the interior of the cluster and the carbon chain is out of the cluster.
    (c) both ionic end and carbon chain are in the interior of the cluster
    (d) both ionic end and carbon chain are on the exterior of the cluster
54. Pentane has the molecular formula C5H12. It has
    (a) 5 covalent bonds
    (b) 12 covalent bonds
    (c) 16 covalent bonds
    (d) 17 covalent bonds
55. Ethanol reacts with sodium and forms two products. These are
    (a) sodium ethanoate and hydrogen
    (b) sodium ethanoate and oxygen
    (c) sodium ethoxide and hydrogen
    (d) sodium ethoxide and oxygen
56. Structural formula of benzene is:

57. The correct structural formula of butanoic acid is

58. Vinegar is a solution of
    (a) 50% – 60% acetic acid in alcohol
    (b) 5% – 8% acetic acid in alcohol
    (c) 5% – 8% acetic acid in water
    (d) 50% – 60% acetic acid in water
59. Mineral acids are stronger acids than carboxylic acids because
    (i) mineral acids are completely ionised
    (ii) carboxylic acids are completely ionised
    (iii) mineral acids are partially ionised
    (iv) carboxylic acids are partially ionised
    (a) (i) and (iv) (b) (ii) and (iii) (c) (i) and (ii) (d) (iii) and (iv)

60. The correct electron dot structure of a water molecule is

61. Which of the following is not a straight chain hydrocarbon?

62. 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

63. Which among the following are unsaturated hydrocarbons?

64. Which of the following does not belong to the same homologous series?
    (a) CH4 (b) C2H6
    (c) C3H8 (d) C4H8
65. The name of the compound CH3 — CH2 — CHO is
    (a) Propanal (b) Propanone (c) Ethanol (d) Ethanal
66. The heteroatoms present in CH3 — CH2 — O — CH2— CH2Cl are
    (i) oxygen
    (ii) carbon
    (iii) hydrogen
    (iv) chlorine
    (a) (i) and (ii) (b) (ii) and (iii)
    (c) (iii) and (iv) (d) (i) and (iv)

67. Which of the following represents saponification reaction?

68. The first member of alkyne homologous series is
    (a) ethyne (b) ethane (c) propyne (d) methane

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