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WAEC - Chemistry (1997 - No. 34)
Which of the following is used as water softener?
Na
2
CO
3
.10H
2
O
CuSO
4
. 5H
2
O
MgSO
4
. 7H
2
O
CaCI
2
.2H
2
O
Na
2
SO
4
. 10H
2
O
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