The method used to remove temporary hardness of water is
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a
Calgon’s method
b
Ion-exchange method
c
Synthetic resin method
d
Clarke’s method
answer is D.
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Detailed Solution
Clarke’s method is used to remove temporary hardness of water, in which bicarbonates of calcium and magnesium are reacted with slaked lime CaOH2CaHCO32+CaOH2→2CaCO3↓+2H2OMgHCO32+2CaOH2→MgOH2↓+2CaCO3↓+2H2O