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NEET-XII-Chemistry

Previous Year Paper year:2017

with Solutions - page 6
Qstn# 88 Prvs-QstnNext-Qstn
  • #88
    The method used to remove temporary
    hardness of water is :
    (1) Calgon's method
    (2) Clark's method
    (3) Ion-exchange method
    (4) Synthetic resins method
    digAnsr:   2
    Ans : ( 2 )
    Sol. Clark's method is used to remove temporary
    hardness of water, in which bicarbonates of
    calcium and magnesium are reacted with
    slaked lime Ca(OH)
    2
    Ca(HCO
    3
    )
    2
    + Ca(OH)
    2
    ï‚® 2CaCO
    3
    + 2H
    2
    O
    Mg(HCO
    3
    )
    2
    + 2Ca(OH)
    2
    ï‚® 2CaCO
    3
     + Mg(OH)
    2
    
    + 2H
    2
    O