1.

Which one of the following is an isotonic pair of solution ?

Answer»

0.15 M NaCI and `0.1 M Na_(2)SO_(4)`
0.2 M UREA and 0.1 M sugar
`0.1 M BaCI_(2)` and `0.1 M NH_(4)CI`
`0.2 M MgSO_(4)` and `0.1 M NH_(4)CI`

SOLUTION :`NaCI rarr Na^(+) + CI^(-)`
0.15 NaCI contains `0.15 xx 2 = 0.3 ` M particles
`NaSO_(4) rarr 2NA^(+) + SO_(4)^(2-)`
`:. 0.1 M Na_(2)SO_(4)` contains `0.1 xx 3 = 0.3` M particles
:. They are isotonic solutions.


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