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(B) Temporary hardness is removed by adding $CaO$ (Clark's process).$CaO + H_2O 	o Ca(OH)_2$$M(HCO_3)_2 + Ca(OH)_2 	o MCO_3 \downarrow + CaCO_3 \dow

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$CaO, Na_2CO_3$

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(B) Temporary hardness is removed by adding $CaO$ (Clark's process).$CaO + H_2O 	o Ca(OH)_2$$M(HCO_3)_2 + Ca(OH)_2 	o MCO_3 \downarrow + CaCO_3 \downarrow + 2H_2O$ (where $M = Ca, Mg$)Permanent hardness is removed by adding $Na_2CO_3$ (Washing soda process).$MSO_4 + Na_2CO_3 	o MCO_3 \downarrow + Na_2SO_4$ (where $M = Ca, Mg$)Thus,$CaO$ removes temporary hardness and $Na_2CO_3$ removes permanent hardness.

Temporary hardness and permanent hardness can be removed by the sequential addition of which of the following?

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