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Question

Permanent hardness is due to SO24 and Cl of Ca2+ and Mg2+ and is removed by the addition of Na2CO3.
CaSO4+Na2CO3CaCO3+Na2SO4
CaCl2+Na2CO3CaCO3+2NaCl
If hardness is 100 ppm CaCO3, amount of Na2CO3 required to soften 10 L of hard water is :

A
2.12 g
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B
0.106 g.
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C
10.6 g
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D
1.06 g
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