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Mercedes Benz S Class coupe > Hermes > Flashcards

Hermes Flashcards

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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?

Study These Flashcards
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?

Study These Flashcards
A

C17H35.Na

Ca, Mg reacts with sdium stearate and forms later

25
What is the cause of temporary harness? What are the methods to remove it?
presence of Mg(HCO3) and Ca(HCO3) BIOLING: CLARKE METHOD: (Ca(OH)2)
26
What is the cause of permanent harness of water?
cholrides and sulphates of calcium and magnesium
27
What is the cure of permanent hardness of water?
1) treatment with NaCO3 (washing soda) 2) calgons method (NaPO3)6 3) ion exchange method, zeolite (NaAlSiO4) 4) sythetic resin method
28
How is hydrogen peroxide made?
1) BaO2.8H2O +H2SO4 ===== BaSO4 + H202 + 8H2O 2) PEROXIDISULPHATE 3) 2-alkyanthraquinol
29
What is the percentage of H2O2 in 100V hydrogen peroxide?
30 %
30
What is the structure of solid hydrogen peroxide? and what temperature?
solid peroxide : plane angle : 90.2 OOH : 101.9 110K H202 become solid
31
What is the structure of liquid hydrogen peroxide?
liquid peroxide : plane angle : 111.5 OOH : 94.8
32
Why is hydrogen peroxide not stored in glass?
the glass might have glass which might react with it
33
With what is hydrogen peroxide stored?
with urea, H3PO3 and C3H5OH
34
( in acidic medium) Fe2+ + H2O2 ====
Fe 3+ [oxidation] + H2O
35
(in acidic medium) PbS + H2O2 =====
PbSO4 [oxidaiton] +H2O
36
(in acidic medium) MnO4 - + H2O2 ====
Mn+2 [reduction] + H2O + O2
37
HOCl + H202 =======
H30+ + Cl- + O2
38
What is the formula of fentons reagent?
FeSO4.H2O2
39
What is the percentage of peroxide in perhydrol? What is its use?
30% H202 | used as an antiseptic agent
40
What is the use of peroxide?
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
How is the emission of N2 in H2 using vehicles reduced ?
by injecting some amount of H20
42
What is the reaction for the formaiton of H2 from hydrocarbons and what are the catalyst required?
CH4 (g) + H20(g) ===== CO + H2 | 1273K and Ni
43
What is the reaction for coal gassification ?
C(s) +H2O(g) ====== CO + H2 | at 1273K
44
What is the reaction for the formation of methanol in ndustries and what is the catalyst required ?
CO + H2 ====== CH3OH | Co is used as a catalyst and the temperature is not mentioned
45
How is high purity di hydrogen obtained?
Ba(OH)2
46
What is the formula of hydrolith ?
CaH2
47
What is water gas?
CO + H2
48
What is producer gas?
CO + N2
49
What is coal gas?
CO + H2 + CH4 + CO2
50
What is natural gas?
methane (CH4)
51
ZrHx what is the value of x?
x =1.3- 1.75
52
TiHx what ist he value of x?
x =1.8 -2.0
53
What is the formula of zeolite?
Al2Si2O8. xH2O
54
How is D2O prepared form H2Oo?
with the helop of repeated electrolysis this process is repeated six times
55
What is the final product of the folowing reaction? Na3As + 3D2O =====
NaOD + AsD3

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