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Chemistry Class 12 > Group 1 Elements > Flashcards

Group 1 Elements Flashcards

1
Q

All group 2 elements are known as alkaline earth metals- true/false

A

False - beryllium is not considered to be and alkaline earth metal

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2
Q

Abundant alkali metals are

A

Sodium and potassium - lithium, rubidium and caesium have lower abundance

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3
Q

Longest lived isotope of Francium

A

Fr 223 [half-life = 21 minutes]

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4
Q

Elements ranked 5th and 6th in abundance in Earth’s crust

A

Calcium and Magnesium respectively [Strontium and Barium have relatively low abundance]

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5
Q

Percentage of igneous rocks which is the element radium

A

10^(-10)%

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6
Q

General electronic configuration of s-block elements

A

[Noble gas] ns1 and [Noble gas] ns2

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7
Q

Igneous rock is formed from

A

Cooled and hardened magma

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8
Q

Diagonal relationship is due to

A

Similarity in ionic sizes and charge/radius ratio of elements

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9
Q

The most electropositive elements are

A

Alkali metals

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10
Q

Ionization enthalpies of alkali metals are

A

Considerably low and decrease down the group

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11
Q

Hydration enthalpy order of group 1 element ions

A

Li+ > Na+ > K+ > Rb+ > Cs+

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12
Q

Lithium salts are never hydrated - true/false

A

False - most lithium salts are hydrated eg. LiCl.2H20

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13
Q

Ionization enthalpy order of group 1 elements

A

Li > Na > K > Rb > Cs> Fr

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14
Q

Metallic radius order of group 1 elements

A

Cs > Rb > K > Na > Li

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15
Q

Ionic radius of group 1 elements

A

Cs > Rb > K > Na > Li

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16
Q

Melting point order of group 1 elements

A

Li > Na > K > Rb > Cs

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17
Q

Boiling point order of group 1 elements

A

Li > Na > K > Rb > Cs

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18
Q

Density order of group 1 elements

A

Cs > Rb > Na > K > Li

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19
Q

Negative SRP value order for group 1 elements

A

Li > Rb > Cs > K > Na

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20
Q

Lithium flame colour

A

Crimson red [670 nm]

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21
Q

Sodium flame colour

A

Yellow [590 nm]

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22
Q

Potassium flame colour

A

Violet [766 nm]

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23
Q

Rubidium flame colour

A

Red violet [780 nm]

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24
Q

Caesium flame colour

A

Blue [455 nm]

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25
Metals used in photoelectric cells
Caesium and Potassium
26
Lithium forms
Monoxides [O(2-)]
27
Sodium forms
Peroxides [O2(2-)]
28
K, Rb, Cs form
Super oxides [O2(-)]
29
Superoxide ion is only stable in the presence of
Large cations like K, Rb, Cs
30
4Li +O2 ---------->
2 Li2O [oxide]
31
2Na + O2 ------------>
Na2O2 [peroxide]
32
M + O2 [M = K, Rb, Cs] --------------------->
MO2 [superoxide]
33
Lithium directly reacts with nitrogen to form
Lithium nitride Li3N
34
Alkali metals are normally stored in
Kerosene oil [Except K]
35
2M + 2H2O [M = alkali metal] ----------------->
2M+ + 2OH- +H2
36
Reaction of lithium with water when compared to sodium
Is less vigorous although Li has most negative SRP value because of small size and very high hydration enthalpy
37
Alkali metals react with hydrogen at temperatures of
623 K [Li at 1073 K]
38
All alkali metal hydrides are
Ionic solids with high melting points
39
2M + H2 [M = alkali metal] ---------------------->
2MH [M+H-]
40
Nature of halides of alkali metals
Ionic in nature except lithium halide which has some covalent character [LiI is most covalent]
41
SEP represents the overall change which includes
Sublimation enthalpy + Ionization enthalpy + Hydration enthalpy
42
More negative is the SRP
Stronger is the reducing agent [substance itself gets oxidized]
43
Alkali metals dissolve in liquid ammonia to give
Deep blue conducting solutions
44
M+ + (x+y)NH3(l) --------------->
[M(NH3)x]+ + [e(NH3)y]-
45
Colour of solution of alkali metal in ammonia is due to
Ammoniated electrons [Solutions are paramagnetic]
46
Solutions of alkali metals and ammonia, on standing, give off
Hydrogen, resulting in the formation of amide
47
M+ + e- + NH3 --------------------------->
MNH2 + 1/2H2
48
In concentrated solution of alkali metal in ammonia
Blue colour changes to bronze colour and solution becomes diamagnetic
49
Lithium + lead
White metal
50
Armour plates are made using
Magnesium
51
Colour of oxides, peroxides and superoxides of alkali metals
``` Oxides = colourless (pure) Peroxides = colourless Superoxides = yellow/orange and paramagnetic ```
52
Order of enthalpy of formation of alkali metal fluorides (negative)
LiF > NaF > KF > RbF > CsF
53
Order of enthalpy of formation of alkali metal chlorides, bromides and iodides (negative)
CsX > RbX > KX > NaX > LiX
54
Order of enthalpy of formation of alkali metal halide (negative)
MF > MCl > MBr > MI
55
Order of melting and boiling points of alkali metal fluorides
MF > MCl > MBr > MI
56
LiF has (solubility)
Low solubility due to high lattice enthalpy
57
CsF has (solubility)
Low solubility due to low hydration enthalpy of constituent ions
58
Halides of lithium are also soluble in
Ethanol, acetone, ethylacetate [LiCl is soluble in pyridine]
59
Stability of alkali metal carbonates and bicarbonates
Increases down the group with electropositive character
60
LiHCO3 exists as a solid - true/false
False
61
Hardest alkali metal
Lithium
62
Lithium + ethyne
Ethynide is not formed unlike other alkali metals
63
Lithium nitrate when heated gives
Li2O, unlike MNO2, which all other alkali metals give
64
Washing soda
Na2CO3.10H20
65
Washing soda is prepared by
Solvay process
66
Solvay process
2NH3 + H2O + CO2 ------------>(NH4)2CO3 (NH4)2CO3 + H2O + CO2 ------------->2NH4HCO3 NH4HCO3 + NaCl --------------->NH4Cl + NaHCO3 2NaHCO3 -------------------->Na2CO3 + CO2 + H2O 2NH4Cl + Ca(OH)2 ---------------->2NH3 + CaCl2 + H20
67
Potassium Carbonate cannot be manufactured by solvay process because
KHCO3 is too soluble to be precipitated out by addition of NH4HCO3
68
Na2CO3.10H2O at 375 K ------------------>
Na2CO3.H2O
69
Na2CO3.H2O above 373K ----------------->
Na2CO3 + H2O (soda ash - white powder)
70
Sea water contains salt % of
2.7 - 2.9% by mass
71
Weight of salt produced annually in India by solar evaporation
50 lakh tonnes
72
NaOH is produced commercially by
Electrolysis of NaCl in Castner-Kellner cell
73
Brine solution is electrolysed in Castner-Kellner cell using
Mercury cathode and carbon anode
74
Na-amalgam + H2O ---------------->
NaOH + Hg + 1/2H2
75
NaHCO3 is used as
Mild antiseptic and in fire extinguishers
76
Weight of metals present in 70 Kg man
90g of Na, 170g of K, 5g of Fe, 0.06g of Cu
77
Most abundant cations within cell fluid
K+
78
More than 1/3rd ATP in a resting animal is consumed by
Sodium-potassium pump
79
Sodium potassium pump in human consumes
15 Kg per 24 hrs in resting human

Chemistry Class 12 (2 decks)

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