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Inorganic Chemistry > P block > Flashcards

P block Flashcards

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1
Q

Diborane and boron oxide react with NH3 to give what?

A

Boron Nitride

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2
Q

Does boron or HBF4 react with NH3 to give Boron nitride?

A

No

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3
Q

True or False
Does AlCl3 sublimes at 100°C under vaccum

A

True

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4
Q

Al(CH3)3 has the three centre two electron bonds in its dimeric structure (True/False)

A

True

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5
Q

BF3 reacts with NaH at 450K to give?

A

B2H6 + NaF

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6
Q

Preparation of B2H6 from NaBH4 and BF3?

A

3NaBH4 + 4BF3 (450K) =====> NaBF4+ 2B2H6

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7
Q

pH of the buffer of aqueous solution of Borax?

A

9

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8
Q

Give preparation of diborane through the reaction of NaBH4 and I2.

A

2NaBH4 + I2 =====> B2H6 + 2NaI + H2

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9
Q

Strongest back bonding in which boron halide?

A

BF3

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10
Q

In Hall heroult’s process, electrolyte is Al2O3?

A

True

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11
Q

Heating aqueous solution of aluminium chloride to dryness gives?

A

AlCl3

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12
Q

In Borax, all boron atoms lie in same plane?

A

False

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13
Q

What kind of units are present in Borax?

A

Tetranuclear units B4O5(OH)4

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14
Q

2X + B2H6 =====> [BH2X2] + [BH4(-)]
X can be
A) NH3
B) CH3NH2
C) (CH3)2NH
D) (CH3)3N

A

A,B,C

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15
Q

Why Al(OH)3 is amphoteric in nature?

A

Because Al–O and O—H bonds can be broken with equal ease.

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16
Q

Which has is liberated on action of Aluminium with conc. NaOH?

A

H2

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17
Q

Aluminium sulphide gives a foul odour when it becomes damp. Give balanced chemical equation.

A

Al2S3 + 6H2O ====> 2Al(OH)3 + 3H2S

                               (rotten egg smell)
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18
Q

How is Boron obtained from Borax?
Give equations

A

Na2B4O7 + 2(hot conc)HCl => 2NaCl + H2B4O7
H2B4O7 + 5H2O ==> 4H3BO3
(sparingly soluble)
2H3BO3 ==> (heat strongly) B2O3 + 3H2O

B2O3 + 6K(or Na or Mg) => 2B +3K2O

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19
Q

Rxn of Al with aqueous NaOH. Give equations.

A

2Al+ 2NaOH + 2H2O ===> 2NaAlO2 + 3H2

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20
Q

Rxn of AlBr3 with H3PO4 and K2Cr2O7

A

AlBr3 + K2Cr2O7+ H3PO4 => K3PO4 + AlPO4+ H2O + Cr(3+) + Br2

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21
Q

C-C bond length is maximum in?
1) diamond
2) C60
3) C70
4) graphite

A

Diamond

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22
Q

Amorphous form of silica?

A

Keiselguhr

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23
Q

C60 is an allotrope of how many hexagons and pentagons?

A

20 hexagons and 12 pentagons

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24
Q

Does silicon existas covalent crystals in solid state?

A

True

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25
Does CCl4 get hydrolysed?
No
26
In silicon dioxide, the structure is..
Each silicon atom is surrounded by 4 oxygen atoms and each O atom is bonded to 2 silicon atoms.
27
The material used in solar cells contains?
Cs and Si
28
Silicone is used as sealant?
True
29
Is Carbon tetrachloride inflammable?
No
30
Products formed when PbO2 and HCl react?
PbO2 + 4HCl => PbCl2 + Cl2 + 2H2O
31
Reaction involved in preparation of tin metal from cassiterite?
SnO2 + 2C ==> 2CO + Sn
32
Preparation of crystalline silicon from SiCl4?
3SiCl4 + 4Al ==> 4AlCl3 + 3Si
33
PbS(heat in air) ==> products?
PbO and PbS
34
PbS(heat in absence of air)===> products?
Pb + SO2
35
Equations for preparing anhydrous aluminium chloride from alumina.
Al2O3 + 3C + 3Cl2 --(heat)---> 2AlCl3 + 3CO
36
HCO3(-) + Al(3+)
HCO3(-) + Al(3+) -----> Al(OH)3 + CO3(2-)
37
Does PbCl2 dissolve on adding excess of HCl.
Yes. Due to formation of [PbCl4](2-)
38
Is Boric acid protonic acid?
No
39
Lithium Aluminium Hydride reacts with silicon tetrachloride to give.
LiCl+ AlCl3+ SiH4
40
Does silicon dioxide exhibit polymorphism?
Yes
41
Structure of silicates in which three oxygen atoms of [SiO4](4-) are shared is
Sheet silicate
42
In freezing winter, white metallic tin gets converted to grey powder. This happens because...
A change in crystalline structure of tin
43
Pb and Sn are extracted from their chief ores by
Self reduction and carbon reduction respectively
44
Is SnCl.2H2O a reducing agent ?
True
45
Does SnO2 react with KOH to form K2[Sn(OH)6]?
Yes
46
The reaction of Pb3O4 with dilute nitric acid to give PbO2 is a redox reaction.
False Pb3O4 + 4HNO3 ===> PbO2 + 2Pb(NO3)2 + 2H2O This reaction is not redox Pb3O4 is a mixture of PbO and PbO2
47
SnCl2 + Cl(-) ===> ?
SnCl2 + Cl(-) ===> SnCl3(-)
48
SnCl2 + Me3N ===> ?
SnCl2 + Me3N ===> SnCl2.[N(CH3)3
49
SnCl2 + 2CuCl2 ===>
SnCl2 + 2CuCl2 ===> SnCl4 + 2CuCl
50
Is Cs used in photoelectric cells?
Yes
51
Ga used in high temperature thermometers?
True
52
B used in bullet proof vests?
True
53
Si used in water repellent spray?
True
54
What is litharge ?
PbO
55
Reaction involved in extraction of Pb?
2PbS + 3O2 ===> 2PbO + 2SO2 PbS + O2 ===> PbSO4 PbS + 2PbO ===> 3Pb + SO2 PbS + PbSO4 ===> 2Pb + 2SO2
56
Rxn SnCl4 with ethyl chloride?
SnCl4 + 2C2H5Cl +2Na ===> C4H10 + 2Na2[SnCl6]
57
Sn + KOH + 4H2O ===>
Sn + KOH + 4H2O ===> K2Sn(OH)6 + 2H2
58
Prepare Si from SiCl4?
SiCl4 + 2Mg(or Zn) ===> Si+ 2MgCl2(or ZnCl2)
59
SiCl4 + CH3MgCl gives
SiCl3(CH3)
60
Prepare Na2SiO3 from SiCl4?
SiCl4 + 4H2O ===> Si(OH)4 Si(OH)4 ===> SiO2 + H2O SiO2 + Na2CO3 ===> Na2SiO3+ 2Na2[SnCl6]
61
A + alkali ==> B (Major product) If B is an oxoacid of phosphorus with no P-H bond, then A is
A is Red P Red P on reaction with alkali gives hypophosphoric acid. Red p + 4NaClO2 + 4H2O(controlled oxidation)==> 2Na2H2P2O6 + 4HC l Na2H2P2O6 + 2H+==> H4P2O6 + 2Na(+)
62
White phosphorus reacts with thionyl chloride to give?
PCl3 + SO2+ S2Cl2

Inorganic Chemistry (5 decks)

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