Q.

Which chemical removes both temporary and permanent hardness in water?

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a

MgCO3

b

CaCO3

c

MgCl2

d

Na2CO3

answer is D.

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Detailed Solution

Na2CO3 removes both temporary and permanent hardness. Following are the chemical reactions.CaCl2+Na2CO3→CaCO3+2NaClCaHCO32+Na2CO3→CaCO3+2NaHCO3Soluble chlorides and bicarbonates of calcium are converted into insoluble carbonates, which can be removed by filtration.
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