GROUP 4A ELEMENTS, CARBON FAMILY
GROUP 4A ELEMENTS, CARBON FAMILY
Total Questions: 70
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1. Which of the following is the most stable?
Pb2+
2. Why can't HF be stored in glass bottles, but in plastic bottles?
HF reacts with the silicate in glass
3. A very small amount of electrical conductivity is measured in _
Silicon and Germanium
4. Which of these group 4A elements has the lowest melting point?
Tin
5. In which of these compounds does the metal has an oxidation state of +2
SnO
6. Elements with giant molecular structures and strong covalent bonds include...
All of the above options
7. The element Germanium in group 4A is a _
Metalloid
8. One of these acts as an insulator
Carbon (diamond)
9. In metalloid of group 4A, the electrical conductivity increases with
Increase in temperature
10. The group 4A element that has the highest bond energy is...
C–C bond
11. Oxides formed by the group 4A elements have oxidation state of
2 and 4
12. All of these tetrachloride are hydrolysed by water except
CCl4
13. At room temperature, group 4A tetrachlorides are...
Liquids
14. On heating lead(II) oxide (PbO), which of these will be produced?
All of the above
15. One of these trends decreases as we move down group 4A
Bond energy
16. Both ionization energy and density increases as we move down group 4A
False
17. The hydrides of germanium are known as...
Germanes
18. The group 4A elements form _ hydrides
Covalent
19. Which of the following elements does not belong to the carbon family?
Aluminium
20. Dry ice is _
Solid carbon dioxide
21. Si–O bond > C–O bond
True
22. A low temperature bath for use in the lab is required to maintain a temperature of 190K, which of these would you use?
Solid CO2 and acetone
23. Which of the following elements belong to group 4A?
Ge, Sn
24. SiCl4, PCl5, SiF62- and PCl3 are compounds which can be hydrolysed by water to give acidic solutions. Which of these molecules possesses the sp3d hybrid orbital type?
PCl5
25. One of the following statements is not true about group 4A elements on descending the group
Their ability to catenate increases
26. Graphite is exploited commercially for the following reasons except...
Hardness
27. One of the following statements is not true about this equation
Lead dioxide is being oxidized
28. Which of the following member of group 4A is toxic?
Lead
29. Which of the following is a metalloid?
Germanium
30. The hardest known allotrope of carbon is...
Diamond
31. Which of the following pair crystallizes with the same structure as a diamond?
Si and Ge
32. _ is the most abundant element in group 4A
Si
33. _ is an impure allotrope of carbon?
Amorphous carbon
34. One of the following represents the electronic arrangement of Silicon
[Ne] 3s2 3p2
35. The structure changes for group 4A elements is from...
The structure changes from giant molecular lattices in carbon and silicon to giant metallic structure in Tin and Lead
36. The ability of carbon to catenate results from the fact that...
The C–C bond is almost as strong as the C–O bond
37. One of the following is not a property of SnH4 and PbH4
They form volatile liquids at room temperature
38. The structure of diamond is...
A three dimensional array of carbon atoms, each atom surrounded tetrahedrally by four other carbon atoms
39. Group 4A elements exhibit inert pair effect which is when...
Two electrons in the p orbital are removed, the remainder in the s orbital are held more strongly by the increased positive charge in the s orbital
40. The first ionization energy decreases greatly between carbon and silicon but decreases very little for the other elements because...
There is a larger increase in nuclear charge due to the filling of d and f orbitals which counterbalances the increase in atomic radii
41. There are 3 types of carbides: _, _ and _
Covalent, interstitial and salt-like
42. Diamond is colourless, and its carbon atoms are _ hybridized
sp3
43. Graphite forms a _ sheet like polymeric structure
Two–dimensional
44. CO is a poisonous gas, sparingly soluble in water and formed by which of these reactions?
HCOOH + H2SO4 → CO + H2O
45. Carbon differs from the other elements in its limitation to a coordination number of four because there are no _ in the second shell
d orbital
46. Carbon dioxide is _
An acidic oxide
47. Pyrex is a type of _ glass
Borosilicate glass
48. Which of these statements is incorrect
Carbon tetrachloride is readily hydrolysed by water
49. Which of these imparts a red colour to glass?
Copper(I) oxide
50. One of these is not a component of glass
Reducing agents
51. The main component in glass is...
Silica
52. Which of these silicon compounds is used to remove permanent hardness of water?
Zeolite
53. Glass is a material with the internal structure of a _, but the hardness of a _
Liquid, solid
54. Which allotrope of carbon has a high refractive index and is used as a gemstone?
Diamond
55. Cyanogen is a radical
False
56. One of these is not a component of greenhouse gas
CO
57. Graphite can conduct electricity due to...
Presence of delocalized electrons
58. A single isolated layer of graphite is known as...
Graphene
59. What is the correct trend for electronegativity as we move down group 4A?
Electronegativity decreases
60. The carbon atoms in graphite are _ hybridized
sp2
61. In which of these carbon allotropes are the carbon atoms arranged in the form of a hollow sphere?
Fullerene
62. Which of these group 4A elements is radioactive?
Fl
63. Silicon reacts with steam at red heat to form
SiO2
64. SiO2 is amphoteric
False
65. A silicone is a polymer composed of...
—R2Si—O—SiR2—
66. Which of these is the primary function of a flux during glass formation?
It lowers the melting point of silica
67. Which of these is a commonly used stabiliser during production of soda glass
CaCO3
68. Which type of glass is usually used in high quality screen protectors for mobile phones?
Alumino-silicate glass
69. Which group 4A element has high density and is used as a protection against radiation?
Pb
70. The most common ore of lead is...
Galena