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Question

Na2CO3 is widely used in softening of hard water. If 1 L of hard water required 0.0106g of Na2CO3, The hardness in ppm (parts per million i.e., 106 ml) of CaCO3 is:

A
0.01 ppm CaCO3
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B
0.10 ppm CaCO3
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C
1.00 ppm CaCO3
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D
10.00 ppm CaCO3
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