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Hydrogen and Water - 2
1.
Soft water consumes a large amount of soap in washing processes.
a) False
b) True
2.
Insoluble calcium and magnesium sulphates reduce the efficiency of engine.
a) False
b) True
3.
Atomic hydrogen is a powerful reducing agent.
a) False
b) True
4.
The PH of water is 9.
a) False
b) True
5.
Nitric acid is used for the preparation of hydrogen in the laboratory.
a) False
b) True
6.
Nitric acid produces hydrogen only when it reacts with
a) Zinc
b) Iron
c) Magnesium
d) Calcium
7.
In ice crystal each oxygen atom is surrounded by
a) Two hydrogen atoms
b) Three hydrogen atoms
c) Four hydrogen atoms
d) Five hydrogen atoms
8.
Water has a maximum density at
a) 100
O
C
b) 3.98
O
C
c) -4.5
O
C
d) 0
O
C
9.
Atomic mass of deutrium is
a) One
b) Two
c) Three
d) Four
10.
Permanent hardness of water is produced due to the presence of
a) Chlorides of calcium and magnesium
b) Carbonates of calcium and Magnesium
c) Bicarbonates of calcium and Magnesium
d) Bisulphates of calcium and Magnesium
11.
The formula of washing soda is
a) Na
2
CO
3
b) NaHCO
3
c) Na
2
SO
4
d) NaOH
12.
Hydroscopic substances are used as
a) Reducing agent
b) None of the above
c) Oxidizing agent
d) Drying agent
13.
Polluted water produces a disease trachoma which effects on
a) Skin
b) Bones
c) Brain
d) Eyes
14.
Number of water molecules in hydrated copper sulphate crystal is
a) Two
b) Five
c) Four
d) Three
15.
Heavy water is represented by the formula
a) H
2
O
b) D
2
O
2
c) D
2
O
d) H
2
O
2
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