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Standard IX
Chemistry
Hardness of Water:Causes, Types and Treatments
Question
100 kg of a sample of water contained 60g of
M
g
S
O
4
the degree of hardness is:
6 ppm
60 ppm
5 ppm
500 ppm
A
500 ppm
B
5 ppm
C
6 ppm
D
60 ppm
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Solution
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10
5
gms of a sample of water contain 60 gms of
M
g
S
O
4
10
6
gms of sample of water contain
60
10
5
×
10
6
= 600 gms of
M
g
S
O
4
120 gms of
M
g
S
O
4
has hardness = 100 ppm
600 gms of
M
g
S
O
4
has hardness =
100
120
×
600
= 500 ppm
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