Halogens And Noble Gases

Question 1

Reaction of bleaching powder with dilute H2SO4 forms which acid?

Answer 1

Hypochlorous acid

Question 2

Reaction of bleaching powder with concentrated H2SO4 forms?

Answer 2

Chlorine gas

Question 3

Reaction of bleaching powder with hydrogen halides forms?

Answer 3

Halogen gas

Question 4

Size of fluorine atom?

Answer 4

72 pm

Question 5

Size of fluoride ion?

Answer 5

136 pm

Question 6

Ionization energy of fluorine?

Answer 6

1681 KJ per mol

Question 7

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

Answer 7

Fluorine

Question 8

Why are fluorides stable with respect to dissociation?

Answer 8

Due to high lattice energy of fluoride ion

Question 9

Which noble gas has lowest dissociation energy?

Answer 9

F2

Question 10

Electronic configuration of fluorine is restricted to?

Answer 10

An octet

Question 11

Hypo_____ous is used in case of which oxidation state?

Answer 11

+1

Question 12

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

Answer 12

Ite

Question 13

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

Answer 13

_____ite

Question 14

Prefix hypo is only used for which oxidation state?

Answer 14

+1

Question 15

For +5 oxidation state, which suffix is used?

Answer 15

Ic

Question 16

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

Answer 16

Ate

Question 17

Prefix per is used only for which oxidation state?

Answer 17

+7

Question 18

HClO is called?

Answer 18

Hypochlorous acid

Question 19

NaClO3 is called?

Answer 19

Sodium Chlorate

Question 20

NaClO4 is called?

Answer 20

Sodium perchlorate

Question 21

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

Answer 21

Ous to ite

Question 22

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

Answer 22

No change, will remain per

Question 23

Ic is paired with?

Answer 23

Ate

Question 24

Commercial name of low molecular mass chlorofluorocarbons is?

Answer 24

Freons

Question 25

CClF3 is an example of?

Answer 25

Freon

Question 26

Which compounds of fluorine are used as refrigerants?

Answer 26

Freons

Question 27

Teflon is polymer of?

Answer 27

Tetraflouroethylene

Question 28

Teflon is used in?

Answer 28

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

Question 29

Which material is used to insulate electric wires?

Answer 29

Teflon

Question 30

Haloethanes are used as?

Answer 30

Anaesthetics

Question 31

Which is the cheapest industrial acid?

Answer 31

hydrochloricacid

Question 32

Used in manufacture of antiseptics?

Answer 32

Chlorine

Question 33

Chlorine is used in the manufacture of?

Answer 33

Antiseptics Insecticides Bleaching powder PVC Solvents Cheapest industrial acid

Question 34

Uses of chlorine in lab?

Answer 34

Manufacturing solvents Manufacturing Cheapest acid HClO3

Question 35

Oxidizing power of halogens is inversely proportional to?

Answer 35

Dissociation energy

Question 36

Oxidizing power of halogens is directly proportional to?

Answer 36

Electron affinity Hydration energy Heat of vaporization

Question 37

Oxidizing power of halogens is useful in?

Answer 37

Decolorization of litmus paper

Question 38

Iodine Penta oxide is formed by heating?

Answer 38

Iodic acid

Question 39

HIO3 is the formula of?

Answer 39

Iodic acid

Question 40

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

Answer 40

240 C

Question 41

Iodine pentaoxide is used for quantitative analysis of?

Answer 41

CO

Question 42

Example of freon is?

Answer 42

CClF3

Question 43

How many oxides does xenon have?

Answer 43

2 oxides

Question 44

XeO3 can formed by hydrolysis of?

Answer 44

XeF6

Question 45

XeF6 is hydrolyzed to form?

Answer 45

Xenon trioxide

Question 46

Hydrolysis involves?

Answer 46

Reaction with water

Question 47

Which oxide of xenon explodes at high temperature?

Answer 47

Xenon trioxide

Question 48

Xenon tetra oxide is formed by reaction of?

Answer 48

BaXeF6 and sulphuric acid (2 moles)

Question 49

BaXeF6 is also called?

Answer 49

Barium perxenate

Question 50

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

Answer 50

Na4XeF6

Question 51

Barium perxenate has the formula?

Answer 51

Ba2XeF6

Question 52

Formula of bleaching powder?

Answer 52

CaOCl2

Question 53

CaOCl2 is formula of?

Answer 53

Bleaching powder

Question 54

Formula of slaked line?

Answer 54

Ca(OH)2

Question 55

Which is the old method for manufacture of bleaching powder?

Answer 55

Hasenclever method

Question 56

In Hasenclever method, how many iron cylinders are used?

Answer 56

4 to 8

Question 57

Iron cylinders in Hasenclever method are provided with?

Answer 57

Stirrirs

Question 58

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

Answer 58

8 shelves

Question 59

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

Answer 59

Rakes

Question 60

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

Answer 60

Counter current principle

Question 61

Xenon forms how many fluorides?

Answer 61

3 flourides

Question 62

Reaction between Xe and F2 to form XeF2 takes?

Answer 62

8 hours

Question 63

Pressure used in formation of XeF4?

Answer 63

6 atm

Question 64

Which flourides of xenon are stored in nickel containers?

Answer 64

XeF2 and XeF4

Question 65

Ratio of xenon to flourine used in manufacture of XeF4?

Answer 65

1 : 5

Question 66

Ratio of xenon to flourine used in manufacture of XeF6?

Answer 66

3 : 20

Question 67

Temperature used in manufacture of XeF6?

Answer 67

300 C

Question 68

Pressure used in manufacture of XeF6?

Answer 68

50 atm

Question 69

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

Answer 69

Stainless steel vessel

Question 70

Which is a strong flourinating agent?

Answer 70

XeF4

Question 71

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

Answer 71

HgF4

Question 72

Reaction of XeF4 with which compound is explosive?

Answer 72

NH3 ( 4 moles )

Question 73

Reactions of XeF6 with which two compounds gives XeOF4?

Answer 73

H2O and SiO2

Question 74

XeOF2 is formed by reaction of Xe with which compound?

Answer 74

OF2

Question 75

NaCl is also called?

Answer 75

Halite

Question 76

Flourspar has chemical formula?

Answer 76

CaF2

Question 77

Boiling point of HF?

Answer 77

19.5 C

Question 78

HF in handled in which material?

Answer 78

Teflon

Question 79

Gaseous HF exists as?

Answer 79

Monomers and Hexamers

Question 80

HI can reduce sulphur to?

Answer 80

H2S

Question 81

Which is the only halogen with four oxides?

Answer 81

Chlorine

Question 82

Bond angle in OF2 molecule is?

Answer 82

105 degrees

Question 83

One method of preparation of ClO2 involves reaction between?

Answer 83

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

Question 84

Second method for preparation of ClO2 involves reaction between?

Answer 84

KClO3 + H2SO4 + H2C2O4

Question 85

Cl2O7 is anhydride of?

Answer 85

Perchloric acid

Question 86

Br2O is formed by reaction between?

Answer 86

HgO + 2(Br2)

Question 87

Reaction of chlorine with cold NaOH produces?

Answer 87

NaClO NaCl H2O

Question 88

Reaction of chlorine with hot NaOH produces?

Answer 88

NaClO3 NaCl H2O

Question 89

Two properties of perchloric acid?

Answer 89

Hygroscopic liquid Colourless

Question 90

Perchloric acid freezes at?

Answer 90

-112 C

Question 91

Perchloric acid decomposes at?

Answer 91

90 C

Question 92

Perchloric acid is stores at what concentration in water?

Answer 92

67%

Question 93

Which compound is used to make unshrinkable wool?

Answer 93

Bleaching powder

Question 94

Ethylene dibromide is used in?

Answer 94

Leaded gasoline to save engine from lead oxide

Question 95

Silver bromide is used in?

Answer 95

Photography

Question 96

Iodized salt contains?

Answer 96

0.02 % KI

Question 97

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