2nd Year Chemistry Chapter 3 Group IIIA and Group IVA Elements Notes

chemistry 12th notes chapter No 3

1. BF₃ acts as acid according to the concept of:


2. The compound which forms the bead in Borax bead test is:


3. Talc is used in:


4. Boric acid is formed when borax reacts with:


5. A gas which burn with blue flame is:


6. Valence shell electronic configuration of the elements of group IIIA is:


7. Chief ore of Al is:


8. The semiconductor material among following is:


9. S, Se, Te and Po are called:


10. On increasing temperature electrical conductivity of boron:


11. Aluminum oxide is:


12. Which of the gas will turns lime water milky:


13. Which element form an ion with change +3:


14. Ortho-boric acid on strong heating to red heat gives:


15. Which one of the following is not a use of red lead, Pb₃O₄:


16. Gibbsite contain ____ water molecules:


17. Moderate electrical conductivity is shown by:


18. Which one of the following halides is polymeric in nature?


19. Pb₃O₄ has chemical name of:


20. Inert pair effect plays an important role in case of:


21. Which of the  element is not present abundantly in earth’s crust:


22. Aluminium reacts with caustic soda to form:


23. Which one of the given is amphoteric in nature?


24. Which of the following does not exist?


25. orthoboric acid when heated to red hot gives


26. Nitric acid can be transported in a container made up of:


27. Which of the following is not ore of aluminium?


28. Which one of the following is not a use of boric acid:


29. Which is the formula of litharge:


30. Alum is not used:


31. Which metal is used in thermite process because of its activity:


32. Which one is more stable


33. Borax bead test is used for the identification of metal that form:


34. What is the formula of Kaolin (Clay):


35. Which of the following is used in making fire proof clothes?


36. Which electronic configuration corresponds to an element of group IIIA of the periodic table:


37. Boric acid cannot be used:


38. Which of the following reactions of Al is used in a photo flash:


39. The Chemical formula of Lead sub oxide:


40. Ordinary glass is:


41. The chief ore of aluminium is:


42. Which compound of silicon used as filler in soap to make it heavy:


43. The element which exhibits maximum catenation property is:


44. Elements which exhibits maximum catenation property:


45. Which one is no use of boric acid?


46. In Borax bead test, when borax is heated with cobalt oxide it forms bead of:


47. Tincal is a mineral of


48. Which one of the following compounds is not organic in nature?


49. Two elements frequently used for making transistors are:


50. In Borax Bead Test, colour of Cupric borates are


51. Which of the following is a weak acid:


52. Boron is always found in nature combined with:


53. Which is the formula of clay:


54. The Chemical formula for white lead is:


55. Tincal is a mineral of:


56. Which element forms an ion with charge 3+:


57. The highly rigid under cooled liquid silica is called:


58. Which element among the following belongs to group IVA of the periodic table:


59. When H₃BO₃ reacts with NaOH, the salt mostly formed is?


60. Sulphur is not present in:


61. Basic lead chromate is formed when lead chromate is boiled with:


62. Which metal is used in the thelinite process because of its activity:


63. Which metal is protected by a layer of its own oxide:


64. Boric Acid reacts with caustic soda to produce:


65. Ethyl borate is formed when boric acid is reacted with:


66. Which one of the following is not an ore of Aluminum:


67. Chemical composition of Colemanite is:


68. The metal which does not give borax bead test is


69. Compounds of Boron behave as Lewis acids because of:


70. Sindur used by Indian women is chemically:


71. Which of the  radicals give blue colour (in cold and hot state) in  oxidizing flame when subjected to Borax Bead test:


72. Stable shape in which PbCrO₄ exist:


73. Aluminum oxide is:


74. B₂H₆ is an example of:


75. The non-polar oxide is:


76. BF₃ acts as Lewis acid because it behaves as:


77. Which of the following is the formula of litharge?


78. Al is badly corroded by:


79. Which naturally occurring substance is SiO₂?


80. The only metal in group IIIA is:


81. Which of the following elements is not present abundantly in earth’s crust?


82. C+ SnO₂ –> Sn + CO₂: In this reaction carbon acts as a:


83. Which is the correct number of lone-pair with oxygen in CO:


84. The aqueous solution of borax is


85. Which is used in the leather industry?


86. Corundum is:


87. In the dried up lakes of Tibet and California _____ is found:


88. Chrome yellow:


89. What is the nature of solution of Borax:


Short Questions

1. B⁺³ ion does not exist but AI+3 ion does.Why?
2. Borate glazes are better than silicate glazes. Explain.
3. Define semiconductor. Write its properties.
4. Give the formula of talc or soap stone. Gives its properties and uses?
5. Give the formulae of four boric acids.
6. Give the names and formulas for oxyacids of boron?
7. Give the names and the formula of different acids of boron?
8. Give two similarities between carbon and silicon.
9. Give uses of boric acid?
10. Give uses of lead sub oxide.
11. How Al finds its uses in metallurgy and photoflash bulbs?
12. How aqueous solution of Borax is alkaline?
13. How borax can be converted to orthoboric acid?
14. How Boron differs from members of its family?
15. How carbon on behaves differently from other members of its own group?
16. How does AI become water soluble by using NaOH?
17. How does AI react with conc.HNO₃?
18. How does AI react with dil.and conc.H₂SO₄?
19. How does H₃BO₃ act as an acid?
20. How does the temperature influence the water of crystallization of borax?
21. How H₃BO₃ can be prepared from colemanite?
22. How H₃BO₃ can be prepared from Na₂B₄O₇?
23. How H₃BO₃ with C₂H₅OH and Na₂CO₃?
24. How inert pair effect controls the oxidation state of Sn and Pb?
25. How litharge changes its colour?
26. How sodium silicate is prepared?
27. How the clay is hardened?
28. How the elements of group III-A show the valency of three?
29. How the glassy mass is produced from borax?
30. How the nature of the oxides of the group III-A change from upper to the downward direction?
31. How the solubility of borax changes with the change of temperature?
32. How weathering phenomenon converts potassium feldspar into clay?
33. How will you convert boric acid into borax and vice versa?
34. Justify that the aqueous solution of borax turns red litmus blue?
35. Mention various allotropic modifications of elements of group IV-A especially carbon?
36. Outline the four use of borax?
37. Show that H₃BO₃ is a monobasic acid.
38. The hydrides of boron have different structures from the hydrides of other family members.How?
39. What are the different forms in which SiO₂ exists in the earth’s crust?
40. What are the important ores and minerals of AI?
41. What are the important ores of SiO₂?
42. What are the properties of water glass?
43. What are the uses of aluminium silicates or clay?
44. What are the uses of sodium silicate?
45. What is anodizing?
46. What is asbestos? Give its uses?
47. What is boric acid? Give its uses.
48. What is chemical garden?
49. What is chemistry of Borax bead test?
50. What is meant by chemical garden?
51. What is quartz and what are its properties?
52. What is silica glass?
53. What is the action of heat on orthoboric acid?
54. What is the effect of heat on H₃BO₃?
55. What is the effect of temperature on semiconductor?
56. What is the nature of compounds which give colored beads in borax bead test?
57. What is vitreous silica? Give its two uses.
58. Which basic radicals give the response to borax bead test?
59. Which elements and compounds act as semiconductor?
60. Why AI is not found free in nature?
61. Why aqueous solution of borax is alkaline?
62. Why are liquid silicones preffered over ordinary organic lubricants?
63. Why carbon behaves differently from other members of its group?
64. Why CO₂ is a gas while SiO₂ is a solid at room temperature?
65. Why diamond is non-conductor of electricity and graphite is good conductor?
66. Why is CO₂ a gas at room temperature while SiO₂ is a soild?
67. Why liquid silicones are preferred over ordinary organic lubricants?
68. Why the heat of sublimation in III-A group elements decrease down the group?
69. Write any four uses of Aluminium.
70. Write down chemical formulae of colemanite and bauxite.
71. Write down formulas of Bauxite and corundum.
72. Write four uses of Borax?
73. Write four uses of sodium silicate.
74. Write the reactions of boric acid with i. Ethyl alcohol ii. NaOH
75. Write two principle uses of Borax?
76. Write two reactions for the preparation of Borax.

Long Questions

1. Describe four points of peculiar behavior of Boron.
2. Explain that aqueous solution of borax is alkaline in nature.
3. Write two preparations and two chemical reactions of Borax.
4. Write down two methods for the preparation of borax. Also explain the action of heat on borax.
5. Explain borax bead test with its chemistry
6. How will you convert boric acid into borax and vice versa?
7. Discuss effect of heat on boric acid
8. What is boric acid? Give its properties.
9. How and under what conditions does aluminium react with : (i) O₂ (ii) NaOH (iii) H₂SO₄ (iv) N₂
10. Write a method of water glass. Also write uses of water glass.”
11. Write a note on aluminium silicate.
12. What are silicones? Give its formula. Write any four uses of silicones.
13. Define semi-conductors. Give example. Write two properties and two uses of semi-conductors.
14. Discuss the importance of Oxides of Lead in Paints.

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