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Chapter 3
Group 3A and Group 4A elements
Test - 3
1.
__________ is used in the mamfacting of flint glan.
a) Boric Acid
b) Litharge
c) Feldspar
d) Antiseptic
2.
Common oxidation states of Boron are _________.
a) 2PbCO
3
b) CAMg
3
(S10
3
)
4
c) Na
3
AlF
6
d) +3, -3
3.
The chemical formula of white lead in ______________.
a) Na
2
S10
3
(Sodium Silicate)
b) 2PbCO
3
c) +3, -3
d) CAMg
3
(S10
3
)
4
4.
The chemical formula of Feldspar is
a) Na
3
AlF
6
b) KAlSi
3
O
8
c) Al
2
F
2
SiO
4
d) Al
2
O
3
: 5H
2
O
5.
Colour of Co beads in reducing flame is
a) Blue
b) Green
c) Brown
d) Colourless
6.
Outer electronic configuration of Si is
a) [He] 2S
2
, 2P
3
b) [Kr]4d10, 5S
2
, 5P
2
c) [He] 2S
2
, 2p
2
d) [Ne] 3S
2
, 3P
2
7.
SiO
2
is used as
a) Semi conductor
b) Non-conductor
c) Excellent insulator
d) Good conductor
8.
Al
2
O
3
. (SiO
2
)
2
. 2H
2
O is chemical formula of
a) talc
b) Clay
c) Zeolite
d) Magnesite
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