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A water sample from a municipal water supply was found to have a $pH = 7.0 .$ On evaporating 2 L of this water, $2.016 g$ of white solid was left behind in the evaporation vessel, i.e., the Total Dissolved Solid (TDS) content of this water was $1008 mg L^{- 1}$ However, addition of soap to a bucket of this water did not produce any visible scum. Based on these findings, one can conclude that :

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there are no ${Ca}^{2 +}$ or ${Mg}^{2 +}$ ion in the water

there are no ${CO}_{3}^{2 -}$ or ${HCO}_{3}^{-}$ ion in the water

concentration of any ion in the water is lower than $0.038 M$

water may be containing ${Na}^{+}$ ions in concentration $> 0.04 M$

answer is B.

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Detailed Solution

The given sample is hard water. There cannot be ${CO}_{3}^{- 2}$ or ${HCO}_{3}^{-}$ because its $pH = 7$ .As a result, the hardness is permanent.

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