The hardness of water caused by 0.25 moles of MgCl2 is equal to i) The hardness of water caused by 25 grams of  CaCO3ii) The hardness of water caused by 0.25 moles of CaCO3iii) The hardness of water caused by 1 moles of CaCO3

 The hardness of water caused by 0.25 moles of MgCl2 is equal to 

i) The hardness of water caused by 25 grams of  CaCO3

ii) The hardness of water caused by 0.25 moles of CaCO3

iii) The hardness of water caused by 1 moles of CaCO3

  1. A

    only ii is correct

  2. B

    i and ii are correct

  3. C

    i and iii are correct 

  4. D

    only i is correct

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    Solution:

    Same moles of substances causes same degree of hardness. 

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