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Match the columns
Column-I Column-II
(A) Clark's method
(p) Mg(HCO_3)_2+2 Ca(OH)_2→ 2 CaCO_3↓+Mg(OH)_2↓ +2 H_2O
(B) Calgon's method
(q) 2 NaZ(s)+M^2+(aq)
(C) Boiling
(r) Ca(HCO_3)_2→ CaCO_3↓+H_2O+CO_2↑
(D) Ion exchange method
(a) A- (s), B-(q), C - (r), D - (p)
(b) A-(q), B-(p), C-(r), D-(s)
(c) A-(p), B-(s), C-(r), D-(q)
(d) A-(r), B-(q), C-(p), D-(s)

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