A) \[N{{a}_{2}}C{{O}_{3}}\]
B) K
C) \[Ca(OCl)Cl\]
D) \[C{{l}_{2}}\]
Correct Answer: A
Solution :
Washing soda, \[(N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O)\]is used to remove permanent hardness of water. It converts\[C{{a}^{2+}}\] and \[M{{g}^{2+}}\]salts (soluble) to carbonates (insoluble). \[Ca{{(HC{{O}_{3}})}_{2}}+N{{a}_{2}}C{{O}_{3}}\to CaC{{O}_{3}}\downarrow +2NaHC{{O}_{3}}\] \[MgC{{l}_{2}}+N{{a}_{2}}C{{O}_{3}}+MgC{{O}_{3}}\downarrow +2NaCl\]
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