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100 mL sample of distilled water, tap wa...

`100 mL` sample of distilled water, tap water and boiled water required, respectively, `2 mL,17 mL` and `7 mL` of soap solution to form permanent lather. The ratio of permanent to temprorary hardness in the tap water is

A

`3:2`

B

`2:3`

C

`1:2`

D

`2:1`

Text Solution

Verified by Experts

The correct Answer is:
C
(c)
(Temprorary and permanent hardness) in tap `H_(2)O=15 mL`
Permanent in boiled `H_(2)O=5mL`
Temprorary hardness in `H_(2)O=15-5=10 mL`
`("Permanent hardness")/("Temporary hardness")=5/10=1:2`
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