JEE Main & Advanced Chemistry Hydrogen & Its Compounds Question Bank Water or hydride of oxygen

  • question_answer which of the following process permanent hardness of water can be removed, by adding [AFMC 2005]

    A) Sodalime

    B) Sodiumbicarbonate

    C) Washing soda

    D) Sodium chloride

    Correct Answer: C

    Solution :

    Washing soda removes both the temporary and permanent hardness by converting soluble calcium and magnesium compounds into insoluble carbonates. \[CaC{{l}_{2}}+N{{a}_{2}}C{{O}_{3}}\to CaC{{O}_{3}}+2NaCl\] \[CaS{{O}_{4}}+N{{a}_{2}}C{{O}_{3}}\to CaC{{O}_{3}}+N{{a}_{2}}S{{O}_{4}}\] \[Ca{{(HC{{O}_{3}})}_{2}}+N{{a}_{2}}C{{O}_{3}}\to CaC{{O}_{3}}+2NaHC{{O}_{3}}.\]

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