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Solutions — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistrySolutions1 Mark
MCQ
At same temperature which pair of the following solutions are isotonic?
  • A
    0.2M BaCl2​ and 0.2M urea
  • B
    0.1M urea and 0.1M NaCl
  • C
    0.1M NaCl and 0.1M K2​SO4​
  • D
    0.1M Ba(NO3​)2​ and 0.1M Na2​SO4​
✓

Answer

  1. 0.1M Ba(NO3​)2​ and 0.1M Na2​SO4

Explanation:

Isotonic solutions have the same osmotic pressure and same molar concentration.

The solution of 0.1M Ba(NO3​)2​ and 0.1M Na2​SO4​ are isotonic.

The osmotic pressure of 0.1M Ba(NO3​)2​

= iMRT = 3 × 0.1RT = 0.3RT

Osmotic pressure of 0.1M Na2​SO4​

= iMRT = 3 × 0.1RT = 0.3RT

The correct answer is "The solution of 0.1M Ba(NO3​)2​ and 0.1M Na2​SO4​ are isotonic".

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