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chemistry > Halogens And Noble Gases > Flashcards

Halogens And Noble Gases Flashcards

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1
Q

Reaction of bleaching powder with dilute H2SO4 forms which acid?

A

Hypochlorous acid

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2
Q

Reaction of bleaching powder with concentrated H2SO4 forms?

A

Chlorine gas

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3
Q

Reaction of bleaching powder with hydrogen halides forms?

A

Halogen gas

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4
Q

Size of fluorine atom?

A

72 pm

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5
Q

Size of fluoride ion?

A

136 pm

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6
Q

Ionization energy of fluorine?

A

1681 KJ per mol

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7
Q

Which is the only element that forms fluorides with noble gases?

A

Fluorine

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8
Q

Why are fluorides stable with respect to dissociation?

A

Due to high lattice energy of fluoride ion

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9
Q

Which noble gas has lowest dissociation energy?

A

F2

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10
Q

Electronic configuration of fluorine is restricted to?

A

An octet

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11
Q

Hypo_____ous is used in case of which oxidation state?

A

+1

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12
Q

Ous is changed to which suffix in case of a salt?

A

Ite

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13
Q

In case of +3 oxidation state, salt is named as?

A

_____ite

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14
Q

Prefix hypo is only used for which oxidation state?

A

+1

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15
Q

For +5 oxidation state, which suffix is used?

A

Ic

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16
Q

For +5 oxidation in salt, which suffix is used?

A

Ate

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17
Q

Prefix per is used only for which oxidation state?

A

+7

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18
Q

HClO is called?

A

Hypochlorous acid

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19
Q

NaClO3 is called?

A

Sodium Chlorate

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20
Q

NaClO4 is called?

A

Sodium perchlorate

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21
Q

If an acid with +3 oxidation state is changed to salt, change in its suffix will be?

A

Ous to ite

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22
Q

If an acid in +7 oxidation state is changed to salt, change in its prefix will be?

A

No change, will remain per

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23
Q

Ic is paired with?

A

Ate

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24
Q

Commercial name of low molecular mass chlorofluorocarbons is?

A

Freons

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25
Q

CClF3 is an example of?

A

Freon

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26
Q

Which compounds of fluorine are used as refrigerants?

A

Freons

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27
Q

Teflon is polymer of?

A

Tetraflouroethylene

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28
Q

Teflon is used in?

A

Corrosion free materials in lab
Non stick cooking pans
Electric wire coating

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29
Q

Which material is used to insulate electric wires?

A

Teflon

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30
Q

Haloethanes are used as?

A

Anaesthetics

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31
Q

Which is the cheapest industrial acid?

A

hydrochloricacid

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32
Q

Used in manufacture of antiseptics?

A

Chlorine

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33
Q

Chlorine is used in the manufacture of?

A

Antiseptics
Insecticides
Bleaching powder
PVC
Solvents
Cheapest industrial acid

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34
Q

Uses of chlorine in lab?

A

Manufacturing solvents
Manufacturing Cheapest acid HClO3

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35
Q

Oxidizing power of halogens is inversely proportional to?

A

Dissociation energy

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36
Q

Oxidizing power of halogens is directly proportional to?

A

Electron affinity
Hydration energy
Heat of vaporization

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37
Q

Oxidizing power of halogens is useful in?

A

Decolorization of litmus paper

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38
Q

Iodine Penta oxide is formed by heating?

A

Iodic acid

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39
Q

HIO3 is the formula of?

A

Iodic acid

40
Q

Iodic acid is heated to which temperature to form iodine penta oxide?

A

240 C

41
Q

Iodine pentaoxide is used for quantitative analysis of?

A

CO

42
Q

Example of freon is?

A

CClF3

43
Q

How many oxides does xenon have?

A

2 oxides

44
Q

XeO3 can formed by hydrolysis of?

A

XeF6

45
Q

XeF6 is hydrolyzed to form?

A

Xenon trioxide

46
Q

Hydrolysis involves?

A

Reaction with water

47
Q

Which oxide of xenon explodes at high temperature?

A

Xenon trioxide

48
Q

Xenon tetra oxide is formed by reaction of?

A

BaXeF6 and sulphuric acid (2 moles)

49
Q

BaXeF6 is also called?

A

Barium perxenate

50
Q

Which compounds can be used in place of barium perxenate for the formation of xenon tetra oxide?

A

Na4XeF6

51
Q

Barium perxenate has the formula?

A

Ba2XeF6

52
Q

Formula of bleaching powder?

A

CaOCl2

53
Q

CaOCl2 is formula of?

A

Bleaching powder

54
Q

Formula of slaked line?

A

Ca(OH)2

55
Q

Which is the old method for manufacture of bleaching powder?

A

Hasenclever method

56
Q

In Hasenclever method, how many iron cylinders are used?

A

4 to 8

57
Q

Iron cylinders in Hasenclever method are provided with?

A

Stirrirs

58
Q

How many cast iron shelves are used in Beckmann’s method?

A

8 shelves

59
Q

Each shelf in Beckmann’s method consists of rotating ______?

A

Rakes

60
Q

What is the principle on which Beckmann’s method works?

A

Counter current principle

61
Q

Xenon forms how many fluorides?

A

3 flourides

62
Q

Reaction between Xe and F2 to form XeF2 takes?

A

8 hours

63
Q

Pressure used in formation of XeF4?

A

6 atm

64
Q

Which flourides of xenon are stored in nickel containers?

A

XeF2 and XeF4

65
Q

Ratio of xenon to flourine used in manufacture of XeF4?

A

1 : 5

66
Q

Ratio of xenon to flourine used in manufacture of XeF6?

A

3 : 20

67
Q

Temperature used in manufacture of XeF6?

A

300 C

68
Q

Pressure used in manufacture of XeF6?

A

50 atm

69
Q

Reaction between Xenon and flourine for the formation of XeF6 takes place in?

A

Stainless steel vessel

70
Q

Which is a strong flourinating agent?

A

XeF4

71
Q

XeF4 is a strong flourinating agent, it reacts with Hg to give?

A

HgF4

72
Q

Reaction of XeF4 with which compound is explosive?

A

NH3 ( 4 moles )

73
Q

Reactions of XeF6 with which two compounds gives XeOF4?

A

H2O and SiO2

74
Q

XeOF2 is formed by reaction of Xe with which compound?

A

OF2

75
Q

NaCl is also called?

A

Halite

76
Q

Flourspar has chemical formula?

A

CaF2

77
Q

Boiling point of HF?

A

19.5 C

78
Q

HF in handled in which material?

A

Teflon

79
Q

Gaseous HF exists as?

A

Monomers and Hexamers

80
Q

HI can reduce sulphur to?

A

H2S

81
Q

Which is the only halogen with four oxides?

A

Chlorine

82
Q

Bond angle in OF2 molecule is?

A

105 degrees

83
Q

One method of preparation of ClO2 involves reaction between?

A

2(ClO3)- + 2Cl- + 4H+

84
Q

Second method for preparation of ClO2 involves reaction between?

A

KClO3 + H2SO4 + H2C2O4

85
Q

Cl2O7 is anhydride of?

A

Perchloric acid

86
Q

Br2O is formed by reaction between?

A

HgO + 2(Br2)

87
Q

Reaction of chlorine with cold NaOH produces?

A

NaClO
NaCl
H2O

88
Q

Reaction of chlorine with hot NaOH produces?

A

NaClO3
NaCl
H2O

89
Q

Two properties of perchloric acid?

A

Hygroscopic liquid
Colourless

90
Q

Perchloric acid freezes at?

A

-112 C

91
Q

Perchloric acid decomposes at?

A

90 C

92
Q

Perchloric acid is stores at what concentration in water?

A

67%

93
Q

Which compound is used to make unshrinkable wool?

A

Bleaching powder

94
Q

Ethylene dibromide is used in?

A

Leaded gasoline to save engine from lead oxide

95
Q

Silver bromide is used in?

A

Photography

96
Q

Iodized salt contains?

A

0.02 % KI

97
Q

Which noble gas has 40 times greater refrigerant capacity than helium?

A

chemistry (6 decks)

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