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NEET Sample Paper NEET Sample Test Paper-20

  • question_answer
    By which of the following process permanent hardness of water can be removed?

    A)  Washing soda

    B)  Soda lime

    C)  Sodium chloride        

    D)  Sodium bicarbonate

    Correct Answer: B

    Solution :

    Permanent hardness can be removed by the addition of washing soda \[(N{{a}_{2}}C{{O}_{3}}.10{{H}_{2}}O),\]addition of so- dium polymetaphosphate [calgon \[{{(NaP{{O}_{3}})}_{n}}\]by ion exchange method]. Hence, the correct option is (b).


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