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Chapter 3
Group 3A and Group 4A elements
Test - 13
1.
By dropping temperature from 100C
o
to 0 C
o
the viscosity of silicone oil will increase less than four folds.
a) False
b) True
2.
2Pb3O
4
®
200C
o
6PbO + O
2
.
a) True
b) False
3.
The stable yellow modification of lead chromate is orthorhombic.
a) True
b) False
4.
Zircon, talc and magnesite are the common minerals of calcium.
a) False
b) True
5.
2Al + 6H
2
SO
4
(Conc.)
®
Al
2
(SO
4
)
3
+ 6H
2
O+3SO
2
a) True
b) False
6.
Chemical formula of Emerald is Al
2
F
2
SiO
4
.
a) False
b) True
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