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Chapter 3
Group 3A and Group 4A elements
Test - 12
1.
Silicon dioxide is resistant towards all acids.
a) True
b) False
2.
In case of Borax bead test, Cr compounds indicate reddish-brown color beads in oxidizing flame.
a) True
b) False
3.
Na
2
B
4
O
7
.10H
2
O
®
Na
2
B
4
O
7
. 2NaBO
2
+ B
2
O
32
.
a) False
b) True
4.
Tetraboric acid contain 3 molecules of water.
a) True
b) False
5.
On dissolution of Al with aqueous alkalies, hydrogen gas and aluminate ions are formed.
a) True
b) False
6.
The chemical formula of clay is Al
2
O
3
(SiO
2
)
2
. 4H
2
O.
a) False
b) True
7.
Hydrated magnesium silicate is commonly known as silicones.
a) True
b) False
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