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Syllabus
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
(A) potassium is solid and sodium distils off at 850°C
(B) potassium being more volatile and distils off thus shifting the reaction forward
(C) sodium is more reactive than potassium 850°C
(D) sodium has less affinity to chloride ions in the presence of potassium ion