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JEE Mains Model Paper 4
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© examsnet.com
Question : 73
Total: 90
Which of the following compounds is used for water softening?
C
a
3
(
P
O
4
)
2
N
a
3
P
O
4
N
a
6
P
6
O
18
N
a
2
H
P
O
4
Validate
Solution:
N
a
6
P
6
O
18
(Sodium hexametaphosphate) commercially known as calgon is used for water softening
2
C
a
C
l
2
+
N
a
2
[
N
a
4
(
P
O
3
)
6
]
→
N
a
2
[
C
a
2
(
P
O
3
)
6
]
+
4
N
a
C
l
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