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Group 13: Boron Family Flashcards

(60 cards)

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1
Q

atomic radius increases down the group except (Group 13)

A

Ga< Al

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2
Q

electronegativity order (Group 13)

A

B > Tl > In > Ga > Al

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3
Q

order of melting point (Group 13)

A

B > Al > Tl > In > Ga

decreases till Gallium and then increases

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4
Q

only non-metal (Group 13)

A

B

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5
Q

________ forms only covalent compounds (Group 13)

A

B

B3+ ion is never formed

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6
Q

_____ have no action on B (Group 13)

A

dilute acid and alkali

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7
Q

maximum covalency of B (Group 13)

A

4

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8
Q

maximum covalency of group 13 elements except B (Group 13)

A

6

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9
Q

acidic oxide (Group 13)

A

B2O3

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10
Q

amphoteric oxide (Group 13)

A

Al2O3

Ga2O3

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11
Q

Basic Oxide (Group 13)

A

In2O3

Tl2O3

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12
Q

all oxides of group 13 is of the form E2O3 but compound of this form of _____ is highly instable and that’s why it forms a stable oxide as ___.

A

Tl,

Tl2O (+1 oxidation state)

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13
Q

B + acid = (Group 13)

A

H3BO3 + corresponding oxides

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14
Q

____ forms a passive layer of Al2O3 (Group 13)

A

HNO3

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15
Q

general reaction with X2 (Group 13)

A

EX3

all forms ionic compound other than Boron

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16
Q

EX3 except BX3 forms diamer in (Group 13)

A

vapour state and non-polar solution

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17
Q

BX3 don’t form diamer due to (Group 13)

A

pπ - pπ back bonding

syrrengic bonding

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18
Q

Al2Cl6 + H2O = (Group 13)

A

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

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19
Q

white fumes appear around the bottle of Al2Cl6 is due to (Group 13)

A

partial hydrolysis

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20
Q

BX3 + H2O = (X = Cl/Br/I) (Group 13)

A

H3BO3 + HX

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21
Q

BF3 + H2O = (Group 13)

A

H3BO3 + 3H+ + 3[BF4]-

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22
Q

EX3 + H2O = (X = Cl/Br/I) (Group 13)

A

[E(H2O)6]3+ +[E(OH)4]-

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23
Q

trend of BX3(acidic nature) (Group 13)

A

BF3 < BCl3 < BBr3 < BI3

extent of back-bonding decreases

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24
Q

compare acidic nature EF3 (Group 13)

A

BF3 > AlF3 > GaF3 > InF3 > TlF3

non-metallic charachter increases

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25
nido-borans (Group 13)
BnHn+4
26
arachno-borans (Group 13)
BnHn+6
27
solid polymer HYDRIDE | Group 13
(AlH3)n
28
boranes (Group 13)
covalent hydrides of borons
29
borax formula (Group 13)
Na2[B4O2(OH)4].8H2O | white crystalline solid
30
hydrolysis of borax forms (Group 13)
B(OH)3 + [B(OH)4]
31
aqueous solution of borax can act as (Group 13)
buffer solution
32
____ is used as an antiseptic as well as water softener (Group 13)
borax
33
borax bead constitutes (Group 13)
2NaBO2 + B2O3 | sodium metaborate + boric anhydride
34
borax bead test is used in salt analysis due to (Group 13)
charachteristic color of many transitional metals
35
which metal loop is used to make borax bead (Group 13)
noble metals | generally Pt
36
Cu2+ | color in borax bead (Group 13)
blue
37
CO2+ | color in borax bead (Group 13)
blue
38
Ni2+ | color in borax bead (Group 13)
brown
39
Fe2+ | color in borax bead (Group 13)
green
40
Cr3+ | color in borax bead (Group 13)
green
41
H3BO3 is (Group 13)
non-protonic acid orthoboric acid it don't disassociate to give H+ but instead it accepts OH-
42
H3BO3 is soapy in touch and ____ soluble in cold water but _____ soluble in hot water (Group 13)
speringly, highly
43
preparation of orthoboric acid (Group 13)
1. borax + HCl | 2. hydrolysis of boron hydrides, halides
44
H3BO3 act as strong acid in presence of (Group 13)
cis-diol
45
boric lotion is used as (Group 13)
1. antiseptic | 2. eyewash
46
H3BO3 is _______ agent (Group 13)
hydratic agent
47
BH3 tends to form (Group 13)
3 - centered 2 electrons bond | banana bond
48
BF3 + LiAlH4 = (Group 13)
B2H6 + LiF + AlF3
49
I2 + NaBH4 = (Group 13)
B2H6 + NaI + H2
50
preperation of B2H6 (Group 13)
1. LiAlH4 2. ion-exchange by NaH 3. NaBH4
51
B2H6 + O2 = (Group 13)
B2O3 + H2O | it's highly explosive
52
B2H6 + H20 = (Group 13)
B(OH)3 + H2
53
B2H6 with excess NH3 (Group 13)
(BN)x
54
B3N3H6 (Group 13)
borazyne borozole inorganic benzene
55
B2H6 + 2NH3 = (Group 13)
B3N3H6 | [BH2(NH3)2]+ [BH4]-
56
B2H6 + NR3 = (Group 13)
BH3.NR3 | adduct
57
general formula for alum (Group 13)
[M1(H2O)6] [M2(H2O)6] (SO4)2
58
oxidation state of M1 and M2 in alum (Group 13)
M1 - (+1) | M2 - (+3)
59
metals that can be used in place of M1 and M2 in alum are (Group 13)
M1 - Na+, K+, NH4+ | M2 - Fe3+, Cr3+, Al3+
60
BN exist in two structure (Group 13)
graphite-like and diamond like

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