If A is the metallic salt, then the white ppt. of D must be of
(A) Stronsium carbonate             (B) Red lead              (C) Barium carbonate        (D) Calcium carbonate

Dear Student,

The reaction scheme of A to D is expressed below,

SrCl2+Na2CO3SrCO3(ppt)+NaCl

The strontium carbonate forms insoluble solid of white precipitate hence the answer is Option (A)

Regards.

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