A) \[BaC{{O}_{3}}\]
B) \[L{{i}_{2}}C{{O}_{3}}\]
C) \[{{K}_{2}}C{{O}_{3}}\]
D) \[N{{a}_{2}}C{{O}_{3}}\]
Correct Answer: C
Solution :
Perchts Process: In this process \[C{{O}_{2}}\] gas is passed in the suspension of magnesium carbonate trihydrate in the solution of potassium chloride thus forming an insoluble double salt. \[2KCl+3MgC{{O}_{3}}.3{{H}_{2}}O+C{{O}_{2}}\xrightarrow{{}}\] \[\underset{(double\,salt)}{\mathop{2[MgC{{O}_{3}}.HC{{O}_{3}}.}}\,4{{H}_{2}}O]\downarrow +MgC{{l}_{2}}\] This double salt is then heated with water under pressure. This salt is decomposed to give water soluble \[{{K}_{2}}C{{O}_{3}}\] and water insoluble \[MgC{{O}_{3}}\]. \[2[MgC{{O}_{3}}.KHC{{O}_{3}}.4{{H}_{2}}O]\xrightarrow[{{H}_{2}}O,\,pressure]{\Delta }\]\[2MgC{{O}_{3}}\downarrow +{{K}_{2}}C{{O}_{3}}(aq)+9{{H}_{2}}O+C{{O}_{2}}\]
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