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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 soap solution used effectively in tap water
`=13-1=12mL`
`therefore` Teporary`+` permanent hardness `=12mL`
Volume of soap solution used effectively in boiled water `=5-1=4mL`
permanent hardness`=4mL`
`therefore` Temporary`+` Permanent hardness`=12mL`
Permanent hardness`=4mL`
Temporary hardness`=8mL`
`therefore("Temporary hardness")/("Permanent hardness")=(8)/(4)=2:1`
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