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P Block > Group 13: Boron Family > Flashcards

Group 13: Boron Family Flashcards

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
Q

nido-borans (Group 13)

26
Q

arachno-borans (Group 13)

27
Q

solid polymer HYDRIDE

Group 13

28
Q

boranes (Group 13)

A

covalent hydrides of borons

29
Q

borax formula (Group 13)

A

Na2[B4O2(OH)4].8H2O

white crystalline solid

30
Q

hydrolysis of borax forms (Group 13)

A

B(OH)3 + [B(OH)4]

31
Q

aqueous solution of borax can act as (Group 13)

A

buffer solution

32
Q

____ is used as an antiseptic as well as water softener (Group 13)

33
Q

borax bead constitutes (Group 13)

A

2NaBO2 + B2O3

sodium metaborate + boric anhydride

34
Q

borax bead test is used in salt analysis due to (Group 13)

A

charachteristic color of many transitional metals

35
Q

which metal loop is used to make borax bead (Group 13)

A

noble metals

generally Pt

36
Q

Cu2+

color in borax bead (Group 13)

37
Q

CO2+

color in borax bead (Group 13)

38
Q

Ni2+

color in borax bead (Group 13)

39
Q

Fe2+

color in borax bead (Group 13)

40
Q

Cr3+

color in borax bead (Group 13)

41
Q

H3BO3 is (Group 13)

A

non-protonic acid
orthoboric acid
it don’t disassociate to give H+ but instead it accepts OH-

42
Q

H3BO3 is soapy in touch and ____ soluble in cold water but _____ soluble in hot water (Group 13)

A

speringly, highly

43
Q

preparation of orthoboric acid (Group 13)

A
  1. borax + HCl

2. hydrolysis of boron hydrides, halides

44
Q

H3BO3 act as strong acid in presence of (Group 13)

45
Q

boric lotion is used as (Group 13)

A
  1. antiseptic

2. eyewash

46
Q

H3BO3 is _______ agent (Group 13)

A

hydratic agent

47
Q

BH3 tends to form (Group 13)

A

3 - centered 2 electrons bond

banana bond

48
Q

BF3 + LiAlH4 = (Group 13)

A

B2H6 + LiF + AlF3

49
Q

I2 + NaBH4 = (Group 13)

A

B2H6 + NaI + H2

50
Q

preperation of B2H6 (Group 13)

A
  1. LiAlH4
  2. ion-exchange by NaH
  3. NaBH4
51
Q

B2H6 + O2 = (Group 13)

A

B2O3 + H2O

it’s highly explosive

52
Q

B2H6 + H20 = (Group 13)

A

B(OH)3 + H2

53
Q

B2H6 with excess NH3 (Group 13)

54
Q

B3N3H6 (Group 13)

A

borazyne
borozole
inorganic benzene

55
Q

B2H6 + 2NH3 = (Group 13)

A

B3N3H6

[BH2(NH3)2]+ [BH4]-

56
Q

B2H6 + NR3 = (Group 13)

A

BH3.NR3

adduct

57
Q

general formula for alum (Group 13)

A

[M1(H2O)6] [M2(H2O)6] (SO4)2

58
Q

oxidation state of M1 and M2 in alum (Group 13)

A

M1 - (+1)

M2 - (+3)

59
Q

metals that can be used in place of M1 and M2 in alum are (Group 13)

A

M1 - Na+, K+, NH4+

M2 - Fe3+, Cr3+, Al3+

60
Q

BN exist in two structure (Group 13)

A

graphite-like and diamond like

P Block (4 decks)

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