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Inorganic Chemistry > Hydrogen > Flashcards

Hydrogen Flashcards

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1
Q

Enthalpy of Hydrogen is more like metals or non-metals

A

non-metals

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2
Q

Hydrogen anion size comparison

A

F,H,Cl,Br,I

small to Big

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3
Q

Which hydrogen is called heavy hygroden

A

Deuterium

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4
Q

Which hydrogen isoteop is radioactive and emits what particles

A

tritium, Beta Particles

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5
Q

Melting Point order of H isotopes

A

H2,D2,T2

small to Big

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6
Q

density order of isotopes of H

A

H2,D2,T2

small to Big

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7
Q

bond dissociation order of isotopes of H

A

H2,D2,T2

small to Big

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8
Q

volatile nature order of isotopes of H isotopes

A

H2,D2,T2

big to small

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9
Q

High purity H2 is obtained by

A

electrolysing warm aqueous barium hydroxide solution between nickel electrodes

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10
Q

water-gas, Syn gas meaning, and process of producing it is called and reaction is?

A

water-gas:- H2 + CO

syn gas:- also called as water gas

coal gasification:- C+H2O—-> CO + H2

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11
Q

The reaction of H with Fluorine,Iodine conditions

A

hydrogen with fluorine can happen in dark too

hydrogen with iodine will happen in the presence of iodine

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12
Q

Which hydrides have polymeric structure and banana bonds

A

BeH2 and MgH2

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13
Q

Only d block element which forms a hydride

A

chromium

CrH

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14
Q

Crystalline structure of ice in atmospheric and low temperatures

A

at Atmospheric pressure, ice crystallises in hexagonal form

at low temperature, it condenses to cubic form

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15
Q

Mg (HCO3) heating product

A

Mg(OH)2 + CO2

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16
Q

Ca (HCO3)2 heating product

A

CaCO3 + H2O + CO2

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17
Q

How to remove temporary and permanent hardness

A

temporary: - boiling, Clark’s method
permanent: - Calgons method( adding sodium hexametaphosphate also called Calgon) ; treatment with sodium carbonate), ion exchange method also called zeolite process ; synthetic resins method

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18
Q

The structure of hydrogen peroxide is planar or non-planar and the dihedral angle is more in the solid or gas phase?

A

H2O2 has a non-planar structure with H and H in different planes and has a dihedral angle more in the gas phase as compared to the solid phase

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19
Q

Heavy water

A

D2O

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20
Q

Peroxide reactions in acidc and basic mediums

A
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21
Q

CuSO4.5H2O structure

A
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22
Q

which method is more suitable for preparing deionized water?

A

synthetic resin method

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23
Q

how is atomic Hydrogen produces?

A

its produced at high temperature in an electric arc or under UV radiations

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24
Q

whats the dissociation percentage of dihydrogen at 2000K

A

0.081%

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25
Q

which diatomic molecules bond dissociation is !?

A

H-H bond dissociation enthalpy is highest

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26
Q

which metal can form interstitial hydride easily

A

Cr

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27
Q

reactivity of H as compared to halgens is

A

very low

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28
Q

which planrts consist motly of hydrogen

A

Jupiter and saturn

29
Q

why is hydrogen less abudant in earth’s atmosphere

A

becuaese of its light nature

30
Q

neutrons in hydrogen , deutrium and tritium

A

hydrogen: 0
deutrium: 1
tritium: 2

31
Q

whats water gas?

A

the mixture of CO and H2

32
Q

catalyst used in water shift gas

A

iron chromate

33
Q

dissociation of dihyrodren in to its atoms at 2000K and 5000K is

A 
2000K= 0.081%
5000K= 95.5%
34
Q

why is H2 relateively iner at room temperature

A

High HH bond enthalpy

35
Q

how is atomic hydrogenproduced

A

at high temperature in an electric ard or under UV radiation

36
Q

hydrogenatino of vegeatble oils is done by whichcatlayst?

A

nickel

37
Q

hydroformylation of olefin s yeilds?

A

aldehydes

38
Q

covalent metal hydrides are

A

MgH2
BeH2
LiH

39
Q

eg of electron rich hydirdres

A

NH3
HF
H2O

40
Q

which metals form interstitial hydrides

and what abt other metals

A

Ni
Pd
Ce
Ac

they have lattice different from that of the parent metal

41
Q

angle of gas pphase water

A

104.5

42
Q

what is used in examination of crystals

A

X rays

43
Q

one of the reasons why H2O is a great source of dihyrogen?

A

cause is can be easily reduced to H2 by highly electropositive metals

43
Q

one of the reasons why H2O is a great source of dihyrogen?

A

cause is can be easily reduced to H2 by highly electropositive metals

44
Q

one of the reasons why H2O is a great source of dihyrogen?

A

cause is can be easily reduced to H2 by highly electropositive metals

45
Q

reason for strong hydrating tendency of water is

A

high dielectric constant

46
Q

eg of interstitial water

A

BaCl2.2H2O

47
Q

whats used in removing the temporary hardness of water

A

boiilng and clark’s method

48
Q

how are the precipitates removed after boiling hard water

A

distillation

49
Q

whats clark’s method

A

in this method calculated amount of lime is added to hard water

50
Q

whats causes temporary hardness

A

Mg and Ca hydrogen carbonates

51
Q

what causes the permanent hardness of water?

A

Mg and Ca sulphates and chlorides

52
Q

how is permanent hardness of water removed

A

treatment with washing soda, calgons method, ion exchange method, synthetic resins method|

53
Q

whats calgon

A

Na6P6O18

54
Q

what zeolite/permutit

A

NaAlSiO4

55
Q

when is permutit/zeolite is said to be used up

A

when all the sodium in it is used up

56
Q

whats Synthetic resins method

A

hard water is softened by using synthetic cation exchangers, this method is more effective than zeolite process

57
Q

what organic molecule does cation exchange resins contain?

A

SO3H

58
Q

To what is R-SO3H changed to? and how?

A

it is changes to RNa and by treating it with NaCl

59
Q

whats the principle behind synthetic resins method and why does the water gets acidic

A

H+ exchanged Na, Ca,Mg ions and other cations present in water his process results in proton release and thus makes water acidic

60
Q

what happens in anion exchange process

A

. OH- exchanges for anions like Cl-,HCO3- and SO4 2- present in water

61
Q

how is H2O2 formed with BaO2

A

acidifying barium peroxide and removing excess water by evaporation under reduced pressure gives H2O2( see the reaction for better understanding)

62
Q

what does H2O2 forms in water?

A

H2O2. H2O

63
Q

color of H2O2 is

A

almost colorless(very pale blue)

64
Q

how is H2O2 marketed?

A

30% of H2O2 is marketed as 100 volume Hydrogen peroxides. it means on mm of 30% H2O2 solution will give 100 ml of O2 at STP

65
Q

whats the dihedral angle of H2O2 structure in gas and solid phase

A

Solid phase: 90.2

Gas phase: 111.5

66
Q

why cant H2O2 be stored in metal containers?

A

because metal surfaces act as catalyst for decomposition of H2O@

67
Q

whats added in H2O2 containers to stabilize it?

A

Urea

68
Q

why is H2O2 kept away from dust

A

cause it can induce explosive decomposition of the compound

Inorganic Chemistry (19 decks)

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