2nd Year Chemistry Chapter 5 The Halogens and The Noble Gases Notes

chemistry 12th notes chapter No 5

1. Which one is chlorous acid?


2. Silver bromide is used in:


3. _________ is used for earthquake prediction


4. Which one of the following will displace Br₂ from an aqueous solution containing Br⁻ ion?


5. Which of the following is most volatile:


6. Which noble gas does not obey octet rule:


7. Goiter is caused due to the deficiency of:


8. Iodine penta oxide, (I₂O₅) is used for the quantitative analyses of


9. Which is the most polarised noble gas:


10. Which of the following has greatest reducing power:


11. Consider the following reaction
6NaOH + 3Cl₂ → 5NaCl + NaClO₃ + 3H₂O
the type of above reaction is:


12. Which hydrogen halide is the weakest acid in solution?


13. Which of the following fluorides of xenon is impossible?


14. Halogen used in toothpaste, it builds protecting covering:


15. Which halogen is most electropositive:


16. The bleaching action of chlorine is due to:


17. In which compound, the oxidation state of xenon is not +6:


18. Which of the following halogen is in solid form at room temperature:


19. Which of the following has greater volatility:


20. Which of the following is monoatomic gas:


21. XeF₆ on partial hydrolysis produces:


22. Which is the strongest acid:


23. Which of the following noble gases does not have an octet of electrons in its outermost shell:


24. Which one is used for etching of glass:


25. Oxidation state of Ca in Ca(OCl)Cl (bleaching powder) is:


26. Which of the following is used to fill fluorescent tubes:


27. Bleaching powder may be produced by passing chlorine over


28. The last member of the family of inert gases is:


29. The noble gas which was discovered first on the Sun and then on the earth:


30. Halogen acid in gaseous state found as equilibrium mixture of monomers and hexamers is:


31. Bleaching powder is not used for bleaching:


32. Fluorine does not have positive oxidation states due to the absence of


33. Astatine (radioactive element) has a half-life:


34. Which of the following is used in radiotherapy:


35. Color of which halogen is not correctly related:


36. Which of the following gases is used in radio therapy for cancer treatment and earthquake predictions?


37. Hydrogen bond is the strongest between the molecules of


38. The halogen that is most easily reduced:


39. Which of the following elements form acidic oxide only?


40. The compounds of Xe are:


41. Which of the following noble gas is not present in atmosphere:


42. This is attributed to many factors except:


43. The gas used in bactericidal lamps in:


44. Cl₂O₇ react with H₂O to form:


45. Bond angle in OF₂ is


46. Which of the following elements show only one oxidation state in its compounds:


47. The intensity of the colour depends on:


48. Chlorine dioxide is a:


49. Radon is formed by the removal of alpha particles from:


50. Which halogen will react spontaneously with Au(s) to produce Au?


51. Refrigeration capacity of liquid neon is greater than liquid helium by:


52. Among fluorides of xenon which is a mild flourinating agent:


53. Mark the element, which can displace three halogens from their compounds:


54. The oxidation states of Xe in its compounds range from:


55. Which one of the following compounds is not known?


56. The most inert element in noble gas group is:


57. What is the reason for lowest bond dissociation energy of F₂ among the halogens?


58. Which silver salt is fairly soluble in H₂O?


59. The Chemical formula of Perchloric acid is :


60. I₂O₅ is prepared by dehydration of:


61. Which amongst the following is the smallest atom?


62. Oxidation state of chlorine in HClO₄ is:


63. Which of the following hydrogen halides is liquid at room temperature


64. The compound which causes burn to skin that heels slowly: 11


65. The anhydride of HClO₄ is:


66. When Cl₂ is passed over by staked lime, the main product is:


67. Which of the following is the strongest acid:


68. Which is the strongest acid?


69. XeF₂ molecule is:


70. Which substance is used for etching of glass?


71. H₂SO₄ and solid potassium dichromate gives:


72. Elements of which of the following groups will form anions most readily:


73. Which of the halogens is most easily reduced:


74. An element that has a high ionization energy and tends to be chemically  inactive would most likely


75. Who reported the first noble gas:


76. Iodine pentoxide acts as a :


77. Which of the following compound is Carnallite:


78. Which halogen occurs naturally in a positive oxidation state?


79. Which of following is most acidic?


80. The weakest oxyacid of Cl is?


81. The chemical formula of iodic acid is:


82. Which is used for making unshrinkable wool:


83. Which of the following acid is used for etching of glass:


84. Which one is percholric acid?


85. The lowest boiling point of helium is due to:


86. HCl to give:


87. The value of ionization potential for inert gases is:


88. The following shows zero oxidation state:


89. Which silver salt is sparingly soluble in H₂O:


90. Which of the following statement is correct?


91. Which of the following react with H₂ in dark:


92. Iodine deficiency in diet is known to cause:


93. All pathogenic microorganisms are killed by:


94. Which of the following represents the correct electronic configuration of the outem-yost energy level of an element of zero (VIIIA) group in the ground state?


95. Which of the following halogens does not form oxyacids:


96. Chlorine heptaoxide (Cl₂O₇) reacts with water to form:


97. HF is stored in:


98. Which of the following hydrogen halide is the weaker acid in solution?


99. Bleaching powder is an example of:


Short Questions

1. Arrange the following ions in the order of increasing sizes?
2. Arrange the following oxyacids in the increasing order of acid strength. HClO₄, HClO₃, HClO₂, HOCl
3. Compare the halogen acids in their reducing properties?
4. Compare the physical states and colors of halogens at room temperature?
5. Describe two uses of helium.
6. Due to which reasons fluorine shows peculiar behavior from other family member?
7. Give important uses of chlorine?
8. Give peculiar behaviour of fluorine?
9. Give the formulas and names of important oxides of chlorine and bromine?
10. Give the important applications of helium and argon?
11. Give the important uses of bromine and iodine?
12. Give the important uses of radon?
13. Give the names and formulas of oxyacids of chlorine and iodine?
14. Halogens are strong oxidizing agents. Justify it?
15. HCIO₄ may cause explosion. Give reason. Give its preparation?
16. How are halogen acids in water?
17. How bleaching powder can act as an oxidizing agent?
18. How do you compare preparations of halogen acids?
19. How do you compare the stabilities of oxyacids of halogens?
20. How do you justify that CI₂O₇ is the anhydride of perchloric acid?
21. How do you justify the decreasing bond dissociation energy of halogen acids?
22. How do you justify the increasing acid strengths of oxyacids of chlorine with increasing no.of O-atoms?
23. How does astatine differ its own family members?
24. How does bleaching powder act as a bleaching agent for fabrics?
25. How does bleaching powder act as an oxidizing agent towards halogen acids?
26. How does radon differ from its own family members?
27. How does the hydrogen boding in HF change the properties of this compound from other halogen acids?
28. How halogen acids are iodized in water?
29. How NaOH reacts with Cl₂ in cold and hot state?
30. How the solubilities of noble gases are affected in water?
31. How the thermodynamic properties of halogen acids change in a group from upper to the downward direction?
32. Justify that reaction of chlorine with NaOH in the cold state is disproprotiontion reaction?
33. Justify that the reaction of chlorine with NaOH in the hot state is disproprotionation reaction?
34. On what basis perchloric acid is considered a valuable analytical reagent?
35. The elements of group VIIIA are called Nobel gases. Comment.
36. What are Freons and Teflon?
37. What are freons. Give there uses?
38. What are noble gases.Why are they inert?
39. What are the important ores and minerals of fluorine and iodine?
40. What are those factors which affect the oxidizing power of halogens?
41. What do you mean by available chlorine and how is it calculated?
42. What factors affect the oxidizing power of halogens?
43. What is iodex and tincture of iodine?
44. What is iodized salt? Write its function.
45. What is meant by Available chlorine? How quality of bleaching powder is tested?
46. What is structural formula of Teflon? Mention its two uses.
47. What is teflon. Give its uses?
48. What is the effect of high voltage on noble gases?
49. Which halogen is used as an antiseptic?
50. Which halogen is used in water treatment to kill bacteria?
51. Why bleaching powder shows bleaching action?
52. Why fluorine and chlorine act as decolourizing agents?
53. Why HCIO₄ is a stronger acid than HBrO₄ than HIO₄?
54. Why HF is a weaker acid than HCI and HI is strongest in the series?
55. Why HF is a weaker acid than other halogen acids?
56. Why iodine has metallic Iustre?
57. Why solubility of noble gases increases down the group?
58. Why the dissociation energies of halogens go on decreasing down the group?
59. Why the elements of group VII-A are called halogens?
60. Why the elements of group VIII-A are called noble gases?
61. Why the elements of VIA other than oxygen show more than two oxidation states?
62. Why the oxidation states of noble gases are usually zero?
63. Write any two uses of krypton?
64. Write disproportionation reaction of chlorine.
65. Write down reactions of chlorine with cold and hot NaOH.
66. Write four uses of halogens.
67. Write the reaction of NaOH with Cl₂ in cold state.
68. Write two uses of each helium and argon.

Long Questions

1. Explain peculiar behaviour of fluorine.
2. Discuss Relative Reactivities of the Halogens as Oxidizing
3. Give rules for nomenclature of oxyacids of halogens.
4. What is Bleaching Powder? How is it prepared commercially?
5. How bleaching powder is prepared? Give uses.
6. How does bleaching powder reacts with (i) NH₃ (ii) HCI (iii) H₂O (iv) dil H₂SO₄?
7. Write down reactions of CaOCl₂ with (i) CO₂ (ii) HCI (iii) NH₃ (iv) H₂SO₄
8. What happened when bleaching powder reacts with: (a) dil. H₂SO₄ (b) conc. H₂SO₄ (c) NH₃ (d) HI
9. Write the Commercial uses of Flourine, Chlorine and their compounds.
10. Write chemical reactions of Fluorides of Xenon.
11. Give eight uses of noble gases.
“12. Give two applications of each.
(i) Helium (ii) Argon”
13. Write uses of neon and argon.

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