Which of the following is/are hard water(s)?

Water containing some potash alum

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Water containing a few drops of HCl

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Water containing common salt

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Water containing calcium nitrate

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Solution

The correct options are
A
Water containing some potash alum

B
Water containing a few drops of HCl

D
Water containing calcium nitrate

Water containing any cation other than $N H_{4}$ and alkali metal is a hard water.

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Which of the following is not the disadvantage of hard water?

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