Carbon and Silicon MCQs [Chemistry]

By: Prof. Dr. Fazal Rehman | Last updated: May 23, 2025

1. : Which of the mentioned properties shows a regular increase on moving down the group from carbon to lead (Group IV A)?
(A) Atomic radius
(B) Atomic volume
(C) Density
(D) All A, B, and C

2. : Group IV A consists of how many elements?
(A) 3
(B) 2
(C) 6
(D) 5

3. : Hemimorphite is an example of
(A) Pyrosilicate
(B) Orthosilicate
(C) Cyclic silicate
(D) Meta silicate

4. : Which of the mentioned is a chain silicate?
(A) Olivine
(B) Zeolite
(C) Beryl
(D) Tremolite

5. : Sodium silicate is helpful and used
(A) As a furniture polish
(B) As a preservative of eggs
(C) In fire proofing of wood and textiles
(D) All A, B, and C

6. : The property of self-linking is known as catenation. Which of the mentioned metals has more catenation tendency?
(A) Ge
(B) Si
(C) C
(D) Sn

7. : Which of the mentioned elements is the main constituent of all inorganic matter?
(A) Carbon
(B) Tin
(C) Silicon
(D) Lead

8. : The penultimate shell of carbon contains electrons _____.
(A) s²p⁶d⁸
(B) s²p⁶
(C) s²p⁶d¹⁰
(D) s²

9. : What forces are present between layers in graphite?
(A) van der Waals forces
(B) Covalent forces
(C) Dipolar forces
(D) Ionic forces

10. : What is the magnitude of C–C bond distance in graphite?
(A) 1.415 Å
(B) 4.145 Å
(C) 0.145 Å
(D) 2.415 Å

11. : Which of the mentioned element has diamond-like structure?
(A) Sn
(B) Si
(C) C
(D) Pb

12. : Which are the gases that are responsible for greenhouse effect?
(A) CO₂ & CH₄
(B) N₂O
(C) CFC
(D) All A, B, and C

13. : Which of the mentioned are helpful and used as water repellent?
(A) Carbides
(B) Silicon
(C) Silicones
(D) Silicates

14. : Which of the mentioned do not freeze at low temperature as -40°C and don’t melt at 200°C?
(A) Carbides
(B) Silicon
(C) Silicones
(D) Silicates

15. : Which of the mentioned statement is not true regarding diamond?
(A) It is a colorless and transparent substance
(B) It is the hardest substance known
(C) Each carbon is sp hybridized
(D) Its density is 2.2 g/cc

16. : Which of the mentioned bonds is weakest?
(A) Si–Cl
(B) Si–O
(C) Si–H
(D) Si–Si

17. : Tetra halides of which elements do not undergo hydrolysis?
(A) C
(B) Si
(C) Sn
(D) All A, B, and C

18. : White lead is _____ .
(A) PbCO₃
(B) PbCO₃·PbO
(C) PbSO₄·PbO
(D) Pb(OH)₂·2PbCO₃

19. : Fullerenes are carbon clusters having cage-like structures. Which of the mentioned carbon clusters are possible?
(A) C₃₂
(B) C₅₀
(C) C₇₆
(D) All A, B, and C

20. : C₆₀ structure is called Buckminster fullerene in the honor of American architect. Which of the mentioned facts is true regarding this structure?
(A) Its structure is like a soccer ball
(B) It has 12 five-membered rings and 20 six-membered rings
(C) The carbon atom is sp² hybridized
(D) All A, B, and C

21. : Setting of cement is improved by which of the following?
(A) Gypsum
(B) Clay
(C) Limestone
(D) Water

22. : Any substance which has solidified from the liquid state with crystallization is known as _____ .
(A) Glass
(B) Fiber
(C) Steel
(D) Asbestos

23. : Glass obtained by placing a layer of butyral plastic with a suitable adhesive between two layers of glass and cementing them by heat and pressure is called
(A) Safety glass
(B) Glass wool
(C) Optical glass
(D) Jena glass

24. : The general trend in the properties of elements of carbon shows that with increase in atomic number
(A) The tendency towards catenation increases
(B) The tendency to show +2 oxidation state increases
(C) Metallic character decreases
(D) The tendency to form complexes with covalence higher than four decreases

25. : The nature of bonds in compounds of carbon and silicon is mostly ______ .
(A) Metallic
(B) Electrovalent
(C) Covalent
(D) Both A and B

26. : Graphite is a good conductor of electricity, as it ____
(A) Has sp-hybridized carbon atoms
(B) Is crystalline
(C) Has free electrons
(D) Has free atoms

27. : Which of the mentioned is true for CO?
(A) Donor and acceptor
(B) Base
(C) Donor
(D) Acid

28. : Which among the following is a false statement?
(A) SiO2 has a structure similar to that of CO₂
(B) Natural Si exists only in the combined state
(C) Si can be prepared by reducing SiO2 with Mg
(D) Si does not exist in graphite-like structure, but exists only in diamond-like structure

29. : Which of the mentioned oxides is neutral as well as toxic?
(A) SnO
(B) CO
(C) CO2
(D) PbO

30. : Which of the mentioned oxides is acidic and solid at room temperature?
(A) CO2
(B) PbO2
(C) SiO2
(D) SnO2

31. : Which of tetrachloride is resistant to hydrolysis?
(A) SiCl4
(B) CCl4
(C) GeCl4
(D) SnCl4

32. : Which of the mentioned compounds would be most ionic in character?
(A) PbCl4
(B) PbCl2
(C) SnCl4
(D) SnCl2

33. : Elements of group 14 having the electronic configuration of their outer shell as _______.
(A) ns2 np2
(B) ns2 np3
(C) ns2 np6
(D) ns2

34. : Which of the mentioned statements is true regarding element of group 14?
(A) Exhibit oxidation state of +3
(B) Form M3+ and M¹+ ions
(C) Exhibit oxidation state of +4
(D) Form M and M¹+ ions

35. : What is Catenation?
(A) Formation of long chain of identical atoms
(B) Deposition of cations
(C) Formation of cations
(D) Formation of covalent bond

36. : The metallic character of group 14 elements
(A) Decreases from top to bottom
(B) Increases from top to bottom
(C) Does not change gradually
(D) Has no significance

37. : Which of the bonds possesses highest bond energy?
(A) Ge-Ge
(B) Si-Si
(C) C-C
(D) Sn-Sn

38. : Inert pair effect is ideally shown by _____.
(A) Pb
(B) C
(C) Sn
(D) Si

39. : The most stable oxidation state shown by lead is/are
(A) +2, +4
(B) +4 only
(C) +3, +4
(D) +2 only

40. : Which of the mentioned statements is not true for carbon?
(A) It forms compounds with multiple bonds
(B) Its ionization energy is very high
(C) It undergoes catenation
(D) It shows inert pair effect

41. : Which property is not exhibited by carbon in its compounds?
(A) Forming bonds to other carbon atoms
(B) Forming compounds with coordination number beyond four
(C) Exhibiting allotropic forms
(D) Forming multiple forms

42. : Diamond and carbon are the ______ of carbon
(A) Allotropic
(B) Amorphous
(C) Isotropic
(D) Isomeric

43. : Which of the mentioned statements is true for the glass?
(A) Super-cooled liquid
(B) Amorphous solid
(C) Crystalline solid
(D) All A, B, and C

44. : Lead pencils contain
(A) Lead
(B) Graphite
(C) A mixture of lead and silica
(D) Lead sulphide

45. : The silicate chains are present in
(A) Silica
(B) Clays
(C) Beryl
(D) Asbestos

46. : Which of the mentioned elements forms only one hydride?
(A) Pb
(B) Si
(C) Sn
(D) Ge

47. : The green color of glass is due to the presence of which of the following?
(A) Mn (IV)
(B) Cobalt (II)
(C) Chromium (III)
(D) Iron (III)

48. : Synthesis gas is a mixture of which of the following?
(A) CO2 & H2
(B) CO & H2
(C) CO2 & CH4
(D) CO2 & N2

49. : Blue color of glass is due to the presence of which of the following?
(A) Mn (II)
(B) Chromium (III)
(C) Iron (III)
(D) Cobalt (II)

50. : Dry ice is ______.
(A) Solid CO
(B) Solid SO₂
(C) Solid NH3
(D) Solid CO₂

51. : Which of the mentioned compounds combines with hemoglobin?
(A) CO
(B) CO2
(C) NO
(D) N2

52. : Which of the mentioned elements is helpful and used in solar cells?
(A) Sn
(B) Ti
(C) Si
(D) Ge

53. : Which of the mentioned compounds is obtained by the hydrolysis of trialkylchlorosilane?
(A) RSi(OH)4
(B) R₂Si(OH)₂
(C) RSi(OH)3
(D) R3Si(OH)

54. : Which of the mentioned materials is helpful and used as refrigerant?
(A) CCl4
(B) PH3
(C) CF2
(D) CF2Cl2

55. : The increasing order of oxidizing power in the following compounds is
(A) GeCl4 < SnCl4 < PbCl4
(B) SnCl4 < PbCl4 < GeCl4
(C) PbCl4 < SnCl4 < GeCl4
(D) GeCl4 < PbCl4 < SnCl4

56. : What is the increasing sequence of reducing power in the following compounds?
(A) SnCl2 < PbCl2 < GeCl2
(B) GeCl2 < SnCl2 < PbCl2
(C) PbCl2 < SnCl2 < GeCl2
(D) GeCl2 < PbCl2 < SnCl2

57. : Carbogen is ______.
(A) Pure form of carbon
(B) COCl2
(C) Mixture of CO and CO2
Answer: (C) Mixture of CO and CO2

58. : During the last two centuries, the atmospheric CO2 contents are increased by _____%.
(A) 13%
(B) 35%
(C) 25%
(D) 40%

59. : The rising world temperature will have serious effect on
(A) Animal production
(B) Agriculture
(C) Human being
(D) All A, B, and C

60. : Which of the mentioned lead oxide is helpful and used in lead storage battery?
(A) Pb3O4
(B) 2PbO PbO2
(C) PbO
(D) PbO2

61. : Which of the mentioned is more electronegative element?
(A) Si
(B) C
(C) Pb
(D) Sn

62. : Which is the allotropic form(s) of carbon?
(A) Fullerenes
(B) Graphite
(C) Diamond
(D) All A, B, and C

63. : Which of the mentioned greenhouse gases are responsible for keeping our planet warm and sustaining life on the earth?
(A) CO2 & CFC
(B) CO2 & water vapors
(C) CO2 & N2O
(D) CO2 & CH4