A) sodium chloride
B) soda lime
C) sodium carbonate
D) sodium sulphate
Correct Answer: C
Solution :
Sodium carbonate removes both the temporary and permanent hardness by converting soluble calcium and magnesium compounds into in soluble carbonates. \[CaC{{l}_{2}}+N{{a}_{2}}C{{O}_{3}}\xrightarrow[{}]{{}}CaC{{O}_{3}}+2NaCl\] \[CaS{{O}_{4}}+N{{a}_{2}}C{{O}_{3}}\xrightarrow[{}]{{}}N{{a}_{2}}S{{O}_{4}}+CaC{{O}_{3}}\]
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