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Published on: 24/08/2019
p - Block Elements - I
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
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1.
Chemical formula of phosgene is_______.
COCl2
CaOCl2
CaCO3
COCI
2.
Which one of the following compounds has similar structure to that of graphite?
Boron nitride
Boron Carbide
Aluminium Carbide
Aluminium Oxide
3.
The stability of +1 oxidation state among Al, Ga, In and Tl increases in sequence _______.
TI < In < Ga < Al
In < TI < Ga < Al
Ga < In < Al < TI
Al < Ga < In < TI
4.
Select the incorrect statement regarding B2H6.
It contains B-B ionic bond
Each boron is Sp3 hybridised
It has two types of hydrogen bonds
it is used as a reducing agent
5.
Lewis acid character of boron trihalides is as a follows _______.
BF3 > BCl3 > BBr3 > BI3
BCI3 > BF3 > BBr3 > BI3
BI3 > BBr3 > BCl3 > BF3
BI3 > BF3 > BCl3 > BBr3
6.
Carbon atoms in fullerene with formula C60 have _______hybridisation.
sp3 hybridised
sp hybridised
sp2 hybridised
partially sp2 and partially sp3 hybridised
7.
The element that does not show catenation among the following p-block elements is ________.
Carbon
silicon
Lead
germanium
8.
In diborane, the number of electrons that accounts for banana bonds is ________.
six
two
four
three
9.
10.
An aqueous solution of borax is________.
neutral
acidic
basic
amphoteric
11.
Carbon dioxide
12.
Carbon
13.
Diborane
14.
Boric acid
15.
Borax
16.
Group 18
17.
Chrome alum
18.
Ammonium alum
19.
Sodium alum
20.
Potash alum
1.
(a)
COCl2
2.
(a)
Boron nitride
3.
(d)
Al < Ga < In < TI
4.
(a)
It contains B-B ionic bond
5.
(c)
BI3 > BBr3 > BCl3 > BF3
6.
(c)
sp2 hybridised
7.
(c)
Lead
8.
(c)
four
9.
(d)
10.
(c)
basic
11.
Non - flammable gas
12.
Graphite
13.
B-H bonds
14.
Colourless crystal
15.
Sodium salt
16.
Inert gases
17.
K2SO4·Cr2(SO4)3.24.H2O
18.
(NH4)2SO4·AI2(SO4)3.24H2O
19.
Na2SO4·AI2(SO4)3·24H2O
20.
K2SO4·Cr2(SO4)3.24.H2O
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