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Hydrogen > Introduction > Flashcards

Introduction Flashcards

1
Q

hydrogen is similar as well as dissimilar to

A

alkali metals and halogens

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2
Q

ionisation energy of H is near to

A

halogens

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3
Q

isotopes have similar ____ and dissimilar ______

A 
chemical properties (same electronic configuration)
physical properties (different mass)
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4
Q

isotope of hydrogen

A

protium
dueterium
tritium

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5
Q

metal + acid =

A

salt + hydrogen

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6
Q

Zn + NaOH =

A

Na2ZnO2 + H2

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7
Q

Al + NaOH =

A

NaAlO2 + H2

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8
Q

in electrolysis of acidified H2O, ___ rods are used

A

Pt

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9
Q

purest form of H2 is obtained from

A

electrolysis of Ba(OH)2 with Ni electrodes

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10
Q

Bosch’s process

A

C + H2O = CO + H2

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11
Q

catalyst of water gas shift

A

Fe2(CrO4)3

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12
Q

CO2 is absorbed by

A

Basic Salt
NaAsO2
sodium aresnite

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13
Q

CO is absorbed by

A

.ammoniacal cupurous chloride

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14
Q

Lane’s process

A

Fe + H2O = Fe2O4 + H2

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15
Q

preparation of dihydrogen

A
  1. laboratory
    i. metal + acid
    ii. amphoteric metal + base
  2. commercial
    i. electrolysis of H2O
    ii. hydrocarbon
    iii. electrolysis of Ba(OH)2
    iv. electolysis of brime
    v. lane’s process
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16
Q

bond dissassociation energy of H2 is

A

maximum among single bonded homo atoms

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17
Q

chemical reactions

A
  1. X
  2. O
  3. N
  4. Alkali metal
  5. as reducing agent
  6. unsturated H-C
  7. oxo-process
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18
Q

oxo-process

A

alkene + water gas in presence of Co = aldehyde

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19
Q

CO + H2 in presence of Co

A

CH3OH

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20
Q

types of hydride

A
  1. ionic
  2. covalent
  3. metallic
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21
Q

s-block metals forming covalent hydrides

A

LiH, BeH2, MgH2

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22
Q

______ hydrides exist in polymeric form

A

BeH2
MgH2
3 centered two electron bond
banana bond

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23
Q

hydrolith

A

CaH2

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24
Q

LiH + H2O =

A

no reaction due to covalent charachter

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25
Q

types of covalent hydrides

A
  1. electron deficient
  2. electron precise
  3. electron rich
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26
Q

bond energy of halides down the group

A

decreases

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27
Q

acidic strength of hydride down the group

A

increases

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28
Q

which d and f blocks element do not form metallic hydrides

A

group 7, 8, 9

and group 6, only Cr forms hydride

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29
Q

oxidation state of M and H in metallic hydride is

A

0

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30
Q

hydrogen in metallic hydride exist in

A

in different lattice

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31
Q

_____ law is not followed by metallic hydride

A

law of constant composition

32
Q

metallic hydrides conduct electricity

A

less effectively as compared to pure metal

33
Q

______ elements can absorb lot of hydrogen thus used in its storage

A

Pd, Pt

34
Q

NH3, HF, H2O, H2O2 (compare BP)

A

NH3 < HF < H2O < H2O2

35
Q

H2O have high

A 
dielectric constant
heat capacity
heat of fusion
heat of vaporisation
surface tension
MP and BP
36
Q

bond angle of H2O

A

104.5 degree

37
Q

ice is a thermal

A

insulator

existence of aquatic life

38
Q

densest water

A

4 degree C

39
Q

ice has a _____ structure

A

hexagonal

40
Q

2H2O = H3O+ + OH-

A

self-protolysis
self-ionisation
of water

41
Q

heavy hydrogen

A

duterium

42
Q

heavy water

A

D2O

43
Q

H2O is trapped in the lattice of

A

BaCl2

44
Q

all properties of D2O is greater than H2O but ______ property of D2O is less than of that of H2O

A

dielectric constant

45
Q

hard water contains

A

bicarbonate / chloride / sulphate / nitrate salts of Mg and Ca

46
Q

temperory hardness of water is due to

A

bicarbonate salts of Mg2+ and Ca2+

47
Q

temperory hardness can be removed by

A
  1. boiling

2. clark’s method

48
Q

reagant used in clark’s method

A

Ca(OH)2

49
Q

percipitate formed in clark’s method

A

CaCO3 , Mg(OH)2

50
Q

ways to remove permanent hardness

A
  1. keep on adding soap
  2. using washing soda
  3. calgon method
  4. ion exchange method
  5. synthetic resin method
51
Q

reaction involved in washing soda way to remove permanent hardness

A

MSO4 + Na2CO3 = MCO3 + Na2SO4
MCl2 + Na2CO3 = MCO3 + NaCl
M = Mg2+ or Ca2+

52
Q

reagant for calgon method

A

sodium hexametaphosphate

53
Q

sodium hexametaphosphate

A

Na6P6O18

Na2[Na4(PO3)6]

54
Q

commercial name of sodium hexametaphosphate

A

calgon

55
Q

zeolite

A

Na Al Si O4

sodium aluminiumsilicate

56
Q

permulite another name

A

zeolite

57
Q

synthetic resin method

A

hard water > cation exchange(acid resin) > acidic soft water > anion exchange > basic resin > demineralised neutral water

58
Q

open book structure

A

H2O2

59
Q

BaO2.8H2O + H2SO4

A

BaSO4 + H2O2

60
Q

electrolysis of HSO4-

A

HO3S-O-O-SO3H > hydrolysis > H2O2 + H2SO4

61
Q

structure of 2-ethylanthraquinol

A

C16H12O2

62
Q

structure of 2-ethylanthraquinone

A

C16H12O2

63
Q

industrial preparation of H2O2

A

auto-oxidation of 2-ethylanthraquinol

64
Q

preparation of D2O2

A

K2S2O8 + D2O = KDSO4 + D2O2

65
Q

H2O2 can act as

A

oxidising as well as reducing agent

66
Q

H2O2 as reducing agent

A

converts into O2

67
Q

H2O2 as a oxidising agent converts into

A

H2O

68
Q

addition of ______ stabilizes H2O2

A

Urea, H3PO4, Glycerol, Acetanilide

69
Q

D2O is formed by

A

exhaustive electrolysis of H2O

repetitive distillation and condensation

70
Q

D2O is used ion nuclear reactor as

A

moderator

71
Q

special forms of H2

A
  1. atomic
  2. nascent
  3. adsorbed
  4. nuclear isomer
72
Q

types of nuclear isomer

A

ortho (same)
para (opposite)
difference in spin

73
Q

more abundent nuclear hydrogen

A

ortho (75%)

100% at 0K

74
Q

most stable nuclear hydrogen

A

para

75
Q

magnetic moment of para

A

zero

76
Q

magnetic moment of ortho

A

twice that of proton

77
Q

Fenton’s Reagent

A

FeSO4 + H2O2

Hydrogen (1 decks)

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