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Inorganic Chemistry > P BLOCK PART 1: BORON FAMILY(13TH GROUP ELEMENTS) > Flashcards

P BLOCK PART 1: BORON FAMILY(13TH GROUP ELEMENTS) Flashcards

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1
Q

Write The MP order of Boron Family

A

B>Al>TI>In>Ga

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2
Q

Which elements from Boron family are unreactive with air?

A

Indium and Gallium

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3
Q

Element from P block unreactive with water

A

Boron

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4
Q

B + HCL (dil) gives

A

No reaction as Dilute HCL/H2So4 is non oxidizing

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5
Q

Al +HNo3(conc) gives

A

No reaction. Aluminum and gallium are passive in reaction with Conc HNo3 due to formation of oxide layer

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6
Q

Al + H2So4(conc)

A

Al(SO4)3 + 3SO2 + 6H2O

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7
Q

Elements from Broon family unreactive to Alkalis

A

Indium and Gallium

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8
Q

Which elements from Boron family don’t combine with halogens?

A

All of them react with halogens

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9
Q

Boron combines with metals on which catalyst?

A

Heat

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10
Q

Al>In in which Ionization energies?

A

In (IE)1 and (IE)3

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11
Q

Ga>TI in which Ionization energies?

A

(IE)2 and (IE)3

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12
Q

Which element Boron family has Highest Reduction Potential is?

A

TI and lowest is for Al

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13
Q

Which element Boron family is most suitable as an electrode?

A

Aluminum due to it’s low reduction potential

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14
Q

Which Hydride from Boron family is a polymeric solid?

A

Indium

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15
Q

Volatile is oil is another name for?
Is is stable or unstable?

A

Gallane (GaH3)
Unstable

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16
Q

Boron Hydrides nature?

A

Covalent nature

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17
Q

Write the structure of (ALH3)x

A

Called Alane. Surrounded octagonally by six hydrogen atoms. Consists of ALH2Al bridges

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18
Q

Are BnHn+6 or BnHn+4 more stable?

A

BnHn+4

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19
Q

How to increase acidity H3BO3?

A

Acidity of orthoboric acid can be increased upon addition of polyhydroxy compounds like glycerol or sugars

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20
Q

Borax on heating gives?

A

Loses water of crystallization to form NA2B4O7 which on heating gives at 740C gives NaBo2 + B2O3(Glassy Bead)

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21
Q

Members from Boron family form what oxides?

A

Sesquioxide M2O3

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22
Q

Periodic trend of nature oxides of in boron family?

A

Change from acidic to amphoteric to basic character

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23
Q

Boric Acid + Naoh

A

Na[B(OH)4]

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24
Q

Na[B(OH)4] on losing water molecules forms?

A

NaBO2(Sodium Metaborate)

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25
3B(OH)3 + Naoh forms
Na[B(OH)4] + H20 + H3O+ as when conc. is very high, then polymeric metaborate exists
26
Is Titanium(III) iodide stable?
No(TII3)
27
Is Titanium(I) iodide stable?
Yes(TII)
28
Fluorides of Al, Ga, In and TI are?
High MP and ionic
29
Which is the only fluoride f of 13th elements whose fluorides are covalent?
BF3
30
Which 2 elements from 13th elements form dihalides?
Gallium and Indium
31
Covalent trend of halides of 13th group?
Decreases down the group, so thallium halides are strongly ionic
32
Nature of Monohalides formed by 13th group elements
Covalent
33
Geometry and hybridization of BF4-
Tetrahdel and sp3
34
Max covalency of boron is what and why?
4 as boron doesn't have d orbital
35
Borax color and is prepared how?
White crystalline solid and prepared by boric acid
36
Boron of low purity? It's color?
Mossain Boron, Black
37
B2O3 forms Boron under what catalysts?
Mg/Na/K
38
Van Arkel Method? Catalyst?
Pyrolysis of BI3, Tungsten and heat
39
Reduction of Boron Halides with what gives Boron under what condition?
Add H2 under 1273K
40
Cathode and anode for Electrolytic method? Catalyst? In this reaction what is discharged and where? what does this do?
Iron rod(Cathode) and Carbon Crucible(anode). Mg is discharged at cathode which reduces B2O3 to B
41
Kenite
Na2B4O7
41
Boron nature for reactions
Powerful reducing agent
42
Boron(iii) Oxide and Silicon Dioxide specialties:
Dissolve only in alkaline solutions, Are solids with macromolecular structure
42
Forms in which Boron and Silicon exist>
Amphorous and crystalline
43
Acids of Silicon and Boron form what? What is the catalyst needed?
Esters when heated with alcohol under presence of H2SO4
44
Silicon's Acid
Si(OH)4
45
Bcl3 + 6H2 gives what? Catalyst?
B2H6 + HCL , SILENT ELECTRIC DISHARGE
46
BORON NITRIDE HAS A STRUCTURE SIMILAR TO
GRAHPITE
47
B2H6.2NH3 COLOUR AND NATURE? WHAT DOES IT COMPRISE OF?
IONIC WHITE SOLID. PG 164 FOR SECOND PART, TARGET 6
47
DIBROANE COLOUR AND STATE? When is stable?
COLURLESS GLASS AND BURSTS INTO FLAMES IN AIR AND STABLE AT LOW TEMP IN ABSENCE OFMOISTURE AND GREASE
48
AMMONIUM HYRDROXIDE ON CALCINATION GIVES?
ALUMINA(AL2O3)
49
ALCL3 + NAOH GIVES
AL(OH)3 {WHITE PPT}
50
AL(OH)3 + NAOH GIVES
SODIUM META ALUMINATE NaALO2
51
ALCL3 EXISTS AS WHAT IN GAS STATE?
DIMER
52
BOND ANDGLES AND LENGTH FOR ALCL3 DIMER?
79,101 AND 118 ARE BOND ANGLES 206(NORMAL BOND LENGTH) AND 221(COORDINATE BOND LENGTH)
53
NAME COMPUND USED: FOR CHRATOGRAPHY MANAFACTURE OF OF GASOLINE PURIFICATION OF WATER MAKING BAUXITE BRICKS ANTISEPCTIC USED AS MORDANT DYES,DRUGS AND PERFUMES
AL2O3 ALCL3 K2SO4.AL(SO4)3.24H2O AL2O3 K2SO4.AL(SO4)3.24H2O K2SO4.AL(SO4)3.24H2O ALCL3
53
ALF3 + HF GIVES
NO REACTION, AS ALF3 IS INOLUBLE IN HF. YOU NEED TO ADD KF TO MAKE SOLUBLE
54
In + Naoh gives
No reaction as Indium and Thallium are not affected by alkalis
55
Aluminum chlorides, bromides, indium iodide exist as iodide in which all?
Vapor state and non polar solvents
56
TL + Koh gives?
No reaction as Indium and Thallium are not affected by alkalis
57
B3N3H6
Borazine
58
b2h6 + nh3 {excess nh3, high temp}?
(BN)x
59
B2H6 + NH3 GIVES BORAZINE UNDER WHAT CONDITIONS?
RATIO 2NH3:1B2H6 AND HIGH TEMP
60
B2H6 + CL2 GIVES? DOES IT NEED CATALYST?
BCL3. YES IT NEEDS 25DEGREE CELCIUS OF HEAT
61
WHERE IS BORAX FOUND IN INDIA?
Sambhar Lake in Rajasthan and Puga Valley in Ladakh
62
Does boron have isotopes? Discuss
Yes, two - B(10) and B(11)
63
Which isotope of Boron is more abundant
B(11) - 81%
64
Discuss occurrence of Aluminum
A In Bauxite In Cryolite In mica
65
Give formula of Bauxite
Al2O3.2H2O
66
Give formula of Cryolite
Na3AlF6
67
Is Nh natural? Give its half life
Nh is synthetically prepared and radioactive Its more stable isotope has a half life of 20 seconds
68
Discuss physical properties of Boron
Boron is non metallic It is hard and black colored It has many allotropic forms It has unusually high MP because of strong crystalline lattice
69
HOW DOES AL3+ ATTAIN STABILITY?
Al3+ compounds achieve stability by forming dimer
70
Discuss hydrolysis of +3 compounds
Most of them get hydrolyzed to [M(OH)4]- which is tetrahedral and the hybridization of M is sp3 Aluminum gets hydrolyzed to [Al(H2O)6]3+ which is octahedral and the hybridization of Al is sp3d2
71
Reactivity of boron with acids/alkalis
Boron does not react with either even at moderate temperatures
72
What anomalies can be seen in Boron
Unlike other metal trihalides, BX3 is insoluble in water Other hydrolyzed compounds are also soluble in water except Boron BF3 (Lewis acid) reacts with NH3 (Lewis base) to complete its octet Other elements dimerize to attain stability but boron does not as its covalency cannot go beyond 4 due to absence of d orbitals
73
borax + WATER
Borax dissolves in water to give alkaline solution Borax + water = NaOH + H3BO3 (weak acid)
74
Structure of H3BO3
White crystalline solid with soapy touch Layer structure where planar BO3 units are joined by hydrogen bonds
75
Solubility of H3BO3
Sparingly soluble in water but solubility increases with heat
76
How is orthoboric acid prepared
By acidifying an aqueous solution of borax By hydrolysis of any boron compounds
77
Hydrolysis of diboranes
B2H6 + H2O = B(OH)3 + H2
78
Structure of B2H6? how MANY B-H-B BONDS ARE PRESENT?
Four terminal hydrogens + two boron atoms are all in one plane connected by single bonds The remaining two hydrogens are bridge atoms above and below this plane with B-H-B bonds
79
bH4-
Borohydride/ Hydridoborates
80
White fumes appear around the bottle of anhydrous aluminum chloride. Give reason
White fumes are due to the presence of HCl gas. Anhydrous aluminium chloride is hydrolysed partly with the moisture in the atmosphere to give HCl gas. This HCl combines with the moisture in the air and appears white in colour
81
Which trihalide is not formed from group 13 elements?
TII3
82
Silicones
Organosilicon compound containing repeated R2SiO units and are polymers
83
All double sulphates having One monovalent basic radical and one trivalent basic radical is?
Alum
84
Hydrides of boron are called?
Boranes
85
The structure of diborane (B2H6) contains: A.Four 2C-2e bonds and two 3C-2e bonds B.Two 2C-2e bonds and 3C-2e bonds C. Two 2C-2e bonds and four 3C-2e bonds D. Four 2C-2e bonds and four 3C-2e bonds. C - Center, e - Electron
Four 2C-2e bonds and two 3C-2e bonds
86
Is diborane planar?
No
87
Diborane has been known to be an effective reagent for reductions of aldehydes and ketones to borate esters, which give alcohols on quenching.
88
Are Boron molecules in B2H6 in same plane?
No
89

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