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JEEMAIN and NEET
>>
Chemistry
>>
Hydrogen
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Q)
Which of the following substance is not present in clear hard water
(
a
)
C
a
(
H
C
O
3
)
2
(
b
)
M
g
C
l
2
(
c
)
C
a
S
O
4
(
d
)
C
a
C
O
3
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