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25mL samples of distiled water, tap wate...

`25mL` samples of distiled water, tap water and boiled water required, respectively, `1mL, 13mL` and `5mL` of soap solution to form a permanent lather. The ratio of temporary to permanent 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:
D

Volume of soap solution used effectively in boiled
Water =`5-1=4 mL`
`:.` Temporary +Permanent hardness `=12 mL`
Permanent hardness =4 mL
Temporary hardness =8mL
`:. ("Temporary hardness ")/("Permanent hardness")=8/4=2:1`
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