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Question

The reddish brown stains when clothes are washed with hard water is due to :



A
Limestone
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B
Calcium
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C
Ferrous ions
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D
All of the above
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Solution

The correct option is C Ferrous ions
If the hard water has ferrous irons (oxidized to the ferrous form) it may leave some reddish brown stains on your clothing after laundry, or on the bathroom enamel surfaces.

Chemistry

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