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Chemistry - 9 Chapter - 2
Chemical combination and Chemical Equations
Test - 2
1.
34 amu is the molecular mass of
a) NH
3
b) H
2
O
c) H
2
S
d) H
2
SO
4
2.
The natural abundance of chlorine-35 is:
a) 100%
b) 25%
c) 75%
d) 50%
3.
C
2
H
5
OH
[1]
(l) + 3O
2[g]
----------->2CO
2[g]
+ 3H
2
O
(2)
a) 6
b) 2
c) 5
d) 3
4.
2 moles of HCl means
a) 2g
b) 58.5g
c) 73g
d) 35.5g
5.
Atomic mass of oxygen is 16, therefore 0.225 mole of oxygen(O
2
) will have molar mass equal to
a) 7.5g
b) 7.2g
c) 7.3g
d) 7.4g
6.
Rusting of iron is a physical change
a) False
b) True
7.
The molecular mass of glucose (C
6
H
12
O
6
) is 180.
a) False
b) True
8.
The formula of ammonium is NH
4
+ and that of ammonia is NH
3
.
a) True
b) False
9.
NO
3
-1 is called nitrate
a) True
b) False
10.
Copper shows only fixed valency and that is 2-.
a) False
b) True
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