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Mercedes Benz S Class coupe > Hermes > Flashcards

Hermes Flashcards

1
Q

By what method did the noble prize winner Harold C Urey separate the dueterium from protium?

A

physical methods

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2
Q

What is the half life of tritium?

A

12.33 years

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3
Q

Which one of the following has more bond enthalpy protium or deuterium?

A

deuterium has more bond enthalpy

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4
Q

Which one of the following reacts faster? protium or deuterium

A

protium reacts faster as it has a lower bond enthalpy

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5
Q

What is the reaction of water gas shift and what are the catalyst?

A

CO + H2O ==== CO2 + H2

673 + FeCrO7

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6
Q

How is the CO2 removed at the end of water gas shift?

A

Sodium Arsenite

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7
Q

Is H2 + O2 == H2O endothermic or exothermic?

A

exothermic

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8
Q

What is the use of Habers process and what is the pressure , temperature and catalyst required for it ?

A

the process of formation of ammonia from H2 and N2

200atm , 673K and Fe

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9
Q

What is the product of the reactions:
CO + H2 ===
What is the required catalyst?

A

CH3OH

Co is used as the catalyst

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10
Q

Out of the following which of them are covalent and which one of hte following are polymers:
LiH , BeH2, MgH2, CaH2, SrH2, BaH2

A

LiH , BeH2, MgH2 are covant in character

BeH2,MgH2 forms polymers

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11
Q

B2H6 is it an acid or base?

A

it is a lewis acid as it does not have a complete octet

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12
Q

Which are the metals that doesnt react with hydrogen ?

A

the chromium groups deosnt react with hydrogen except chromum

group 7,8,9 doesnt react with hydrogen

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13
Q

What is the hydride of chromium?

A

CrH

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14
Q

What are the metals whose hydrides doesnt have any effect in its lattice structure?

A

Ni, Pd, Ce, Ac

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15
Q

What are the metals whose hydrides doesnt have any effect in its lattice structure and energy ?

A

Ni, Pd, Ce, Ac

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16
Q

What are the metals that can accomodate a large amount of hydrogen?

A

Pd, Pt
they are sometimes used for the storage of hydrogen

they have a high affinity for hydrogen

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17
Q

Why deos some covalent compounds get dissolved in water which is polar in nature?

A

due to hydrogen bonding

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18
Q

What is the lattice structure of water in ice in high temperature and low temperature?

A

low temp : cube

high temp : hexagon

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19
Q

What is the product of

P4O10 + 6H20 ====

A

4 (H3PO4 )

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20
Q

What is the product of SiCl4 + 2H20 =====

A

SiO2 + 4HCl

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21
Q

What is the water in CrCl3 ? How is the water present here?

A

[Cr(H2O)6]3+ + 3Cl-

coordinated water

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22
Q

What is the water in BeCl2.xH2O?What is the value of x ? How is the water present here?

A

x = 2

water is present in interstitial form

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23
Q

What is the value of x in CuSO4.xH2O ?What is the form in which it is present in ? How is the water present here? How many water is present in it in coordinated form?

A

5
(Cu.4H20 ).H20.SO4
4 - in coordinated form
1 = hydrogen bonded

24
Q

What is the formula of sodium stearate? What happens when it reacts with hard water?

A

C17H35.Na

Ca, Mg reacts with sdium stearate and forms later

25
Q

What is the cause of temporary harness? What are the methods to remove it?

A

presence of Mg(HCO3) and Ca(HCO3)

BIOLING:
CLARKE METHOD: (Ca(OH)2)

26
Q

What is the cause of permanent harness of water?

A

cholrides and sulphates of calcium and magnesium

27
Q

What is the cure of permanent hardness of water?

A

1) treatment with NaCO3 (washing soda)
2) calgons method (NaPO3)6
3) ion exchange method, zeolite (NaAlSiO4)
4) sythetic resin method

28
Q

How is hydrogen peroxide made?

A

1) BaO2.8H2O +H2SO4 ===== BaSO4 + H202 + 8H2O
2) PEROXIDISULPHATE
3) 2-alkyanthraquinol

29
Q

What is the percentage of H2O2 in 100V hydrogen peroxide?

A

30 %

30
Q

What is the structure of solid hydrogen peroxide? and what temperature?

A

solid peroxide :
plane angle : 90.2
OOH : 101.9

110K H202 become solid

31
Q

What is the structure of liquid hydrogen peroxide?

A

liquid peroxide :
plane angle : 111.5
OOH : 94.8

32
Q

Why is hydrogen peroxide not stored in glass?

A

the glass might have glass which might react with it

33
Q

With what is hydrogen peroxide stored?

A

with urea, H3PO3 and C3H5OH

34
Q

( in acidic medium) Fe2+ + H2O2 ====

A

Fe 3+ [oxidation] + H2O

35
Q

(in acidic medium) PbS + H2O2 =====

A

PbSO4 [oxidaiton] +H2O

36
Q

(in acidic medium) MnO4 - + H2O2 ====

A

Mn+2 [reduction] + H2O + O2

37
Q

HOCl + H202 =======

A

H30+ + Cl- + O2

38
Q

What is the formula of fentons reagent?

A

FeSO4.H2O2

39
Q

What is the percentage of peroxide in perhydrol? What is its use?

A

30% H202

used as an antiseptic agent

40
Q

What is the use of peroxide?

A

1) used to make perydrol
2) sodium perborate and per carbonate which are used in high quantity
3) used in synthesis of hydroquinone , tartaric acid , certain food products , cephalosporin
4) used in environmental chemistyr

41
Q

How is the emission of N2 in H2 using vehicles reduced ?

A

by injecting some amount of H20

42
Q

What is the reaction for the formaiton of H2 from hydrocarbons and what are the catalyst required?

A

CH4 (g) + H20(g) ===== CO + H2

1273K and Ni

43
Q

What is the reaction for coal gassification ?

A

C(s) +H2O(g) ====== CO + H2

at 1273K

44
Q

What is the reaction for the formation of methanol in ndustries and what is the catalyst required ?

A

CO + H2 ====== CH3OH

Co is used as a catalyst and the temperature is not mentioned

45
Q

How is high purity di hydrogen obtained?

A

Ba(OH)2

46
Q

What is the formula of hydrolith ?

A

CaH2

47
Q

What is water gas?

A

CO + H2

48
Q

What is producer gas?

A

CO + N2

49
Q

What is coal gas?

A

CO + H2 + CH4 + CO2

50
Q

What is natural gas?

A

methane (CH4)

51
Q

ZrHx what is the value of x?

A

x =1.3- 1.75

52
Q

TiHx what ist he value of x?

A

x =1.8 -2.0

53
Q

What is the formula of zeolite?

A

Al2Si2O8. xH2O

54
Q

How is D2O prepared form H2Oo?

A

with the helop of repeated electrolysis

this process is repeated six times

55
Q

What is the final product of the folowing reaction?

Na3As + 3D2O =====

A

NaOD + AsD3

Mercedes Benz S Class coupe (5 decks)

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