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Permanent hardness of water may be removed by the addition of

1 Alum

2 Sodium carbonate

3 Lime

4 Potassium permanganate

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(2) Sodium carbonate

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meron po bang minerals ang astoroids po ba?

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hai sir pls send me Appsc Assistant Statistical Officer(ASO) previous papers. And Apsrtc MST previous papers. Thanks you sir.

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