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Mercedes Benz S Class coupe > S class coupe > Flashcards

S class coupe Flashcards

1
Q

Does Beryllium fall into alkaline earth metal group?

A

no

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2
Q

What is the isotope of Francium that has the highest half life and for how long?

A

223 Fr

21 mins

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3
Q

What is the rarest of all s block elelments?

A

Radium

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4
Q

Which is the most abundant s block element?>

A

Na and K

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5
Q

What is igenous rock ?

A

these are the rocks that forms from the cooling of molten magma

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6
Q

What are some of the ions that are found in large proporions in livign organimsms and what is their funciton?

A

Na , K , Mg and Ca

they are important for keeping ionic balance and conduction of neural signals

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7
Q

What is the atomic size order of the alkali metal group?

A

Li < Na < K< Rb< Cs< Fr

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8
Q

What is the order of ionization potential of the alkali metal group?

A

Li < Na < K< Rb< Cs< Fr

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9
Q

What is the order of hydration enthelpy of the alkali metal grou p ?

A

Li > Na > K > Rb> Cs > Fr

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10
Q

What is the order of aqueous radius order of the alkali earth metals?

A

Li > Na > K > Rb> Cs > Fr

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11
Q

Why are the lithiums salts mostly hydrated ? What ist he water of hydraiton of LiCl 3 ?

A

becuase of their high hydration enthalpy

LiCl3.2H20

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12
Q

What is the order of density of the alkali metal group ?

A

Li < K < Na < Rb< Cs

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13
Q

What is hte order of metallic bond strenght of the alkali metals?

A

Li > Na > K > Rb> Cs > Fr ( less size better bonds)

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14
Q

What is the color of the flame of oxidation of Li , Na, k, Rb and Cs?

A 
Li  :  crimson red 
Na : yellow 
K : violet 
Rb : red violet 
Cs : blue
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15
Q

What are the elements used to make photoelectric cells?

A

Cs and K

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16
Q

What are the oxides of Li , Na, k, Rb and Cs?

A 
Li  :  oxide 
Na : peroxide 
K : superoxide 
Rb : super oxide  
Cs : super oxide
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17
Q

What is the reaciotn between air and alkali metals?

A

only oxides except

Li + N2 – Ni3N

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18
Q

What is the oxidation state of KO2 ?

A

+1

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19
Q

Which element reacts least vigorously with water in the alkali metal block and why?

A

Li due to small size and high hyration energy

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20
Q

At what temperature deos Li react with H2 ?

A

1073 K

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21
Q

What is the reaction between liquid ammonia and what is its color and nature to magnets?

A

M + (x +y)NH3 –> [M(NH3)x]+ + [e(NH3)y ]-

it s BLUE in color and PARAMAGNETIC

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22
Q

What happens when the alkali metal amonia solution is kept undisturbed for long? And what is its color and nature to magnets?

A

M+ + e - + NH3 ——> MNH2 + 1/2H2

is is bronze color and DIAMAGNETIC

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23
Q

What is the Li alloy used to make plantes?

A

Al + Li

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24
Q

What is the Li alloy used to make armour ?

A

Li + Mg

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25
Q

What is the aloy used to make thermonuclear reactors?

A

Li + Mg

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26
Q

What were used as ati knock additives to petrol?

A

organo lead compounds

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27
Q

What is used as coolant in nuclear reactors?

A

liquid Li

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28
Q

What is the used of KCl?

A

fertilizers

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29
Q

What is used to manufacture soft soap?

A

K OH

30
Q

What is an excellent absorber of CO2?

A

KOH

31
Q

What is the metal used to make photoelectric cell?

A

Cs

32
Q

What is the hydrolysis reaction of various metal oxides?
M2O + H2O :
M2O2 + H2O :
MO2 + H2O :

A

M2O + H2O : MOH
M2O2 + H2O : MOH +H2O2
MO2 + H2O : MOH + H2O2 + O2

33
Q

What is the color of superoxide?

A

yellow orange

34
Q

Na2O2 oxidizing or reducing in nature?

A

oxidising agent

35
Q

What is the color of alkali metal hydroxides?

A

brittle and white

36
Q

What is the melting and boiling point order of metal halides?

A

MF > MCl >MBr > MI ( both boiling and melting point)

37
Q

What is the reason for the low solubility of LiF ?

A

due to high lattice energy

38
Q

What is the reason for insolubility of CsI?

A

due to low hdration energy

39
Q

Where are the various halides of Li soluble in ?

A

ethanol , acetone , ethlyacetate

and LiCl pyridine

40
Q

What is the strongest reducing metal in the 1st group ?

A

Li

41
Q

Do alkali metal chlorides form hydrates? have water of cyrystalization ?

A

no but is it is present only in LiCl. 2H20

42
Q

Is is the ydogen carbonte of alkali metals solid or liquid?

A

alkali metals are solid in nature except Li

43
Q

What is the product of ethyne and alkali metal ?

A

etynide but only in the case of Li it deos not react

44
Q

Where is LiCl and MgCl more soluble in water or ethanol?

A

ethanol due to polariation

45
Q

What is the water of hydration of LiCl and MgCl2?

A

LiCl 2H2O

MgCl2 , 8 H20

46
Q

What are the reactions of the solvay process ?

A

2NH3 + H2O + CO2 ====> (NH4)2CO3

(NH4)2CO3 + H20 + O2 + CO2 === > 2NH4HCO3

2NH4HCO3 + NaCl ====> NH4Cl + NaHCO3

NaHCO3 + HEAT == Na2CO3

NH4Cl + Ca(OH)2 ====> NH3 + CaCl2 + H20

47
Q

What is the process used for the formation of Na2CO3.10 H2O

A

solvay process

48
Q

What is soda ash and what temperature deos it for/m?

A

Na2CO3.H2O

375 K

49
Q

What is the temperature at which all the water in the waashing soda leaves it?

A

> 373 K

Na2Co3

50
Q

What happens when CO3- is aded to water?

A

CaCO3 -2 + H2O ===== HCO3- AND OH-

51
Q

What is the use of sodium carbonate? What is it otherwise known as?

A

washing soda

1) water softner
2) used to manufacture glass, soap , borax and caustic soda
3) paper , paints, and textile
4) it i sused to quantative and qualitative reagent

52
Q

How do we obtain pure and crude NaCl?

A

crude : crystallization of brine solution

pure sodium chloride: passing HCl saturated NaCl through the solution with impurites. The Cl reacts with Na

53
Q

What is the use of NaCl?

A

1) common salt or table salt

2) Na2O2 , NaOH, Na2CO3

54
Q

What are the uses of sodium hyrozide?

A

1) manufacturing soap
2) petroleum refining
3) bauxite purification
4) textile industry
5) for preparation of pure fat and oil
6) as a labroratory reagent

55
Q

How is NaHCO3 - prepared?

A

Na2Co3 + H2O+ CO2 ===== NaHCO3

56
Q

What is used for antseptic for skin?

A

NaOH

57
Q

What is used in fire extinguisher?

A

NaOH

58
Q

What is the concentration of Na and K in and out of RBC?

A

Na == 10 mmHg

K === 105 mmolk

59
Q

What is the concentration of Na and K in and out of RBC?

A

Na == 10 mmOlK

K === 105 mmolk

60
Q

What is the concentration of Na and K in the plasma of blood?

A

Na == 143 mmOlK

K === 5 mmolk

61
Q

What is th water of hydration of MgCl2 and CaCl2 ?

A

Mg : 6 water

ca : 6 water

62
Q

What is the trned for electropositive character of the alkaline eath metals ?

A

increases down the group

63
Q

What is the flame test color of Be, Mg , Ca Sr, Ba ?

A 
Be : no color 
Mg : no color 
Ca :brick red 
Sr : crimson red 
Ra : apple green
64
Q

How is BeCl2 formed ?

A

BeO + C + Cl2 ==== BeCl2 + CO

65
Q

What is the reaction between hydrides of alkali earth metals?

A

other alkaline earth metals drectly reacts with hydrogen to orm hydrides

BeCl 2 + LiAlH4 ==== 2 BeH2 + LiCl + AlCl3

66
Q

Which is more ionic in nature alkali earth metals or alkali metal?

A

alkali metals

67
Q

Are alkaline metals alkaline or acidic ?

A

alkaline

but in BeO we see covalent character (amphoteric in nature )

68
Q

Are halides of alkaline metals soluble in wate?

A

all halides are soluble in water

except in Be halides which are soluble in non polar solvent

69
Q

At what temperature does the BeCl dimer dissociate?

A

1200 K

70
Q

What is the water of crystallization of MgCl2 , CaCl2 , SrCl2 and BaCl2 ?

A

MgCl2 === 8 water
CaCl2 ==== 6 water
SrCl2 === 6 water
BaCl2 === 2 water

71
Q

Are the carbonates of alkaline earth metals soluble in water?

A

no

Mercedes Benz S Class coupe (5 decks)

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